WebSVN – SvarDOS – Diff – /svarcom/trunk/command.c


/* This file is part of the SvarCOM project and is published under the terms
 * of the MIT license.
 *
 * Copyright (C) 2021 Mateusz Viste
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */
 
/*
 * SvarCOM is a command-line interpreter.
 *
 * a little memory area is allocated as high as possible. it contains:
 *  - a signature (like XMS drivers do)
 *  - a routine for exec'ing programs
 *  - a "last command" buffer for input history
 *
 * when svarcom starts, it tries locating the routine in memory.
 *
 * if found:
 *   waits for user input and processes it. if execing something is required, set the "next exec" field in routine's memory and quit.
 *
 * if not found:
 *   installs it by creating a new PSP, set int 22 vector to the routine, set my "parent PSP" to the routine
 *   and quit.
 *
 * PSP structure
 * http://www.piclist.com/techref/dos/psps.htm
 *
 *
 *
 * === MCB ===
 *
 * each time that DOS allocates memory, it prefixes the allocated memory with
 * a 16-bytes structure called a "Memory Control Block" (MCB). This control
 * block has the following structure:
 *
 * Offset  Size     Description
 *   00h   byte     'M' =  non-last member of the MCB chain
 *                  'Z' = indicates last entry in MCB chain
 *                  other values cause "Memory Allocation Failure" on exit
 *   01h   word     PSP segment address of the owner (Process Id)
 *                  possible values:
 *                    0 = free
 *                    8 = Allocated by DOS before first user pgm loaded
 *                    other = Process Id/PSP segment address of owner
 *   03h  word      number of paragraphs related to this MCB (excluding MCB)
 *   05h  11 bytes  reserved
 *   10h  ...       start of actual allocated memory block
 */
 
#include <i86.h>
#include <dos.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
 
#include <process.h>
 
#include "cmd.h"
#include "env.h"
#include "helpers.h"
#include "redir.h"
#include "rmodinit.h"
 
#define FLAG_EXEC_AND_QUIT 1
 
struct config {
  unsigned char flags;
  char *execcmd;
  unsigned short envsiz;
};
 
 
/* parses command line the hard way (directly from PSP) */
static void parse_argv(struct config *cfg) {
  unsigned short i;
  const unsigned char *cmdlinelen = (unsigned char *)0x80;
  char *cmdline = (char *)0x81;
 
  memset(cfg, 0, sizeof(*cfg));
 
  /* set a NULL terminator on cmdline */
  cmdline[*cmdlinelen] = 0;
 
  for (i = 0;;) {
 
    /* skip over any leading spaces */
    for (;; i++) {
      if (cmdline[i] == 0) return;
      if (cmdline[i] != ' ') break;
    }
 
    if (cmdline[i] != '/') {
      output("Invalid parameter: ");
      outputnl(cmdline + i);
      /* exit(1); */
    } else {
      i++;        /* skip the slash */
      switch (cmdline[i]) {
        case 'c': /* /C = execute command and quit */
        case 'C':
          cfg->flags |= FLAG_EXEC_AND_QUIT;
          /* FALLTHRU */
        case 'k': /* /K = execute command and keep running */
        case 'K':
          cfg->execcmd = cmdline + i + 1;
          return;
 
        case 'e': /* preset the initial size of the environment block */
        case 'E':
          i++;
          if (cmdline[i] == ':') i++; /* could be /E:size */
          atous(&(cfg->envsiz), cmdline + i);
          if (cfg->envsiz < 64) cfg->envsiz = 0;
          break;
 
        case '?':
          outputnl("Starts the SvarCOM command interpreter");
          outputnl("");
          outputnl("COMMAND /E:nnn [/[C|K] command]");
          outputnl("");
          outputnl("/E:nnn     Sets the environment size to nnn bytes");
          outputnl("/C         Executes the specified command and returns");
          outputnl("/K         Executes the specified command and continues running");
          exit(1);
          break;
 
        default:
          output("Invalid switch:");
          output(" ");
          outputnl(cmdline + i);
          exit(1);
          break;
      }
    }
 
    /* move to next argument or quit processing if end of cmdline */
    for (i++; (cmdline[i] != 0) && (cmdline[i] != ' ') && (cmdline[i] != '/'); i++);
 
  }
}
 
 
static void buildprompt(char *s, unsigned short envseg) {
  /* locate the prompt variable or use the default pattern */
  const char far *fmt = env_lookup_val(envseg, "PROMPT");
  if ((fmt == NULL) || (*fmt == 0)) fmt = "$p$g"; /* fallback to default if empty */
  /* build the prompt string based on pattern */
  for (; *fmt != 0; fmt++) {
    if (*fmt != '$') {
      *s = *fmt;
      s++;
      continue;
    }
    /* escape code ($P, etc) */
    fmt++;
    switch (*fmt) {
      case 'Q':  /* $Q = = (equal sign) */
      case 'q':
        *s = '=';
        s++;
        break;
      case '$':  /* $$ = $ (dollar sign) */
        *s = '$';
        s++;
        break;
      case 'T':  /* $t = current time */
      case 't':
        s += sprintf(s, "00:00"); /* TODO */
        break;
      case 'D':  /* $D = current date */
      case 'd':
        s += sprintf(s, "1985-07-29"); /* TODO */
        break;
      case 'P':  /* $P = current drive and path */
      case 'p':
        _asm {
          mov ah, 0x19    /* DOS 1+ - GET CURRENT DRIVE */
          int 0x21
          mov bx, s
          mov [bx], al  /* AL = drive (00 = A:, 01 = B:, etc */
        }
        *s += 'A';
        s++;
        *s = ':';
        s++;
        *s = '\\';
        s++;
        _asm {
          mov ah, 0x47    /* DOS 2+ - CWD - GET CURRENT DIRECTORY */
          xor dl,dl       /* DL = drive number (00h = default, 01h = A:, etc) */
          mov si, s       /* DS:SI -> 64-byte buffer for ASCIZ pathname */
          int 0x21
        }
        while (*s != 0) s++; /* move ptr forward to end of pathname */
        break;
      case 'V':  /* $V = DOS version number */
      case 'v':
        s += sprintf(s, "VER"); /* TODO */
        break;
      case 'N':  /* $N = current drive */
      case 'n':
        _asm {
          mov ah, 0x19    /* DOS 1+ - GET CURRENT DRIVE */
          int 0x21
          mov bx, s
          mov [bx], al  /* AL = drive (00 = A:, 01 = B:, etc */
        }
        *s += 'A';
        s++;
        break;
      case 'G':  /* $G = > (greater-than sign) */
      case 'g':
        *s = '>';
        s++;
        break;
      case 'L':  /* $L = < (less-than sign) */
      case 'l':
        *s = '<';
        s++;
        break;
      case 'B':  /* $B = | (pipe) */
      case 'b':
        *s = '|';
        s++;
        break;
      case 'H':  /* $H = backspace (erases previous character) */
      case 'h':
        *s = '\b';
        s++;
        break;
      case 'E':  /* $E = Escape code (ASCII 27) */
      case 'e':
        *s = 27;
        s++;
        break;
      case '_':  /* $_ = CR+LF */
        *s = '\r';
        s++;
        *s = '\n';
        s++;
        break;
    }
  }
  *s = '$';
}
 
 
static void run_as_external(const char far *cmdline) {
  char buff[256];
  char const *argvlist[256];
  int i, n;
  /* copy buffer to a near var (incl. trailing CR), insert a space before
     every slash to make sure arguments are well separated */
  n = 0;
  i = 0;
  for (;;) {
    if (cmdline[i] == '/') buff[n++] = ' ';
    buff[n++] = cmdline[i++];
    if (buff[n] == 0) break;
  }
 
  cmd_explode(buff, cmdline, argvlist);
 
  /* for (i = 0; argvlist[i] != NULL; i++) printf("arg #%d = '%s'\r\n", i, argvlist[i]); */
 
  /* must be an external command then. this call should never return, unless
   * the other program failed to be executed. */
  execvp(argvlist[0], argvlist);
}
 
 
static void set_comspec_to_self(unsigned short envseg) {
  unsigned short *psp_envseg = (void *)(0x2c); /* pointer to my env segment field in the PSP */
  char far *myenv = MK_FP(*psp_envseg, 0);
  unsigned short varcount;
  char buff[256] = "COMSPEC=";
  char *buffptr = buff + 8;
  /* who am i? look into my own environment, at the end of it should be my EXEPATH string */
  while (*myenv != 0) {
    /* consume a NULL-terminated string */
    while (*myenv != 0) myenv++;
    /* move to next string */
    myenv++;
  }
  /* get next word, if 1 then EXEPATH follows */
  myenv++;
  varcount = *myenv;
  myenv++;
  varcount |= (*myenv << 8);
  myenv++;
  if (varcount != 1) return; /* NO EXEPATH FOUND */
  while (*myenv != 0) {
    *buffptr = *myenv;
    buffptr++;
    myenv++;
  }
  *buffptr = 0;
  /* printf("EXEPATH: '%s'\r\n", buff); */
  env_setvar(envseg, buff);
}
 
 
int main(void) {
  static struct config cfg;
  static unsigned short rmod_seg;
  static unsigned short far *rmod_envseg;
  static unsigned short far *lastexitcode;
  static unsigned char BUFFER[4096];
 
  parse_argv(&cfg);
 
  rmod_seg = rmod_find();
  if (rmod_seg == 0xffff) {
    rmod_seg = rmod_install(cfg.envsiz);
    if (rmod_seg == 0xffff) {
      outputnl("ERROR: rmod_install() failed");
      return(1);
    }
/*    printf("rmod installed at seg 0x%04X\r\n", rmod_seg); */
  } else {
/*    printf("rmod found at seg 0x%04x\r\n", rmod_seg); */
  }
 
  rmod_envseg = MK_FP(rmod_seg, RMOD_OFFSET_ENVSEG);
  lastexitcode = MK_FP(rmod_seg, RMOD_OFFSET_LEXITCODE);
 
  /* make COMPSEC point to myself */
  set_comspec_to_self(*rmod_envseg);
 
/*  {
    unsigned short envsiz;
    unsigned short far *sizptr = MK_FP(*rmod_envseg - 1, 3);
    envsiz = *sizptr;
    envsiz *= 16;
    printf("rmod_inpbuff at %04X:%04X, env_seg at %04X:0000 (env_size = %u bytes)\r\n", rmod_seg, RMOD_OFFSET_INPBUFF, *rmod_envseg, envsiz);
  }*/
 
  do {
    char far *cmdline = MK_FP(rmod_seg, RMOD_OFFSET_INPBUFF + 2);
    unsigned char far *echostatus = MK_FP(rmod_seg, RMOD_OFFSET_ECHOFLAG);
 
    /* (re)load translation strings if needed */
    nls_langreload(BUFFER, *rmod_envseg);
 
    /* skip user input if I have a command to exec (/C or /K) */
    if (cfg.execcmd != NULL) {
      cmdline = cfg.execcmd;
      cfg.execcmd = NULL;
      goto EXEC_CMDLINE;
    }
 
    if (*echostatus != 0) outputnl(""); /* terminate the previous command with a CR/LF */
 
    SKIP_NEWLINE:
 
    /* print shell prompt (only if ECHO is enabled) */
    if (*echostatus != 0) {
      char *promptptr = BUFFER;
      buildprompt(promptptr, *rmod_envseg);
      _asm {
        push ax
        push dx
        mov ah, 0x09
        mov dx, promptptr
        int 0x21
        pop dx
        pop ax
      }
    }
 
    /* revert input history terminator to \r */
    if (cmdline[-1] != 0) {
      cmdline[(unsigned short)(cmdline[-1])] = '\r';
    }
 
    /* wait for user input */
    _asm {
      push ax
      push bx
      push cx
      push dx
      push ds
 
      /* is DOSKEY support present? (INT 2Fh, AX=4800h, returns non-zero in AL if present) */
      mov ax, 0x4800
      int 0x2f
      mov bl, al /* save doskey status in BL */
 
      /* set up buffered input */
      mov ax, rmod_seg
      push ax
      pop ds
      mov dx, RMOD_OFFSET_INPBUFF
 
      /* execute either DOS input or DOSKEY */
      test bl, bl /* zf set if no DOSKEY present */
      jnz DOSKEY
 
      mov ah, 0x0a
      int 0x21
      jmp short DONE
 
      DOSKEY:
      mov ax, 0x4810
      int 0x2f
 
      DONE:
      /* terminate command with a CR/LF */
      mov ah, 0x02 /* display character in dl */
      mov dl, 0x0d
      int 0x21
      mov dl, 0x0a
      int 0x21
 
      pop ds
      pop dx
      pop cx
      pop bx
      pop ax
    }
 
    /* if nothing entered, loop again (but without appending an extra CR/LF) */
    if (cmdline[-1] == 0) goto SKIP_NEWLINE;
 
    /* replace \r by a zero terminator */
    cmdline[(unsigned char)(cmdline[-1])] = 0;
 
    /* I jump here when I need to exec an initial command (/C or /K) */
    EXEC_CMDLINE:
 
    /* move pointer forward to skip over any leading spaces */
    while (*cmdline == ' ') cmdline++;
 
    /* update rmod's ptr to COMPSPEC so it is always up to date */
    rmod_updatecomspecptr(rmod_seg, *rmod_envseg);
 
    /* handle redirections (if any) */
    if (redir_parsecmd(cmdline, BUFFER) != 0) {
      outputnl("");
      continue;
    }
 
    /* try matching (and executing) an internal command */
    if (cmd_process(rmod_seg, *rmod_envseg, cmdline, BUFFER) >= -1) {
      /* internal command executed */
      redir_revert(); /* revert stdout (in case it was redirected) */
      continue;
    }
 
    /* if here, then this was not an internal command */
    run_as_external(cmdline);
 
    /* revert stdout (in case it was redirected) */
    redir_revert();
 
    /* execvp() replaces the current process by the new one
    if I am still alive then external command failed to execute */
    outputnl("Bad command or file name");
 
  } while ((cfg.flags & FLAG_EXEC_AND_QUIT) == 0);
 
  return(0);
}
 

Rev 443	Rev 444
1	`/* This file is part of the SvarCOM project and is published under the terms`	1	`/* This file is part of the SvarCOM project and is published under the terms`
2	`* of the MIT license.`	2	`* of the MIT license.`
3	`*`	3	`*`
4	`* Copyright (C) 2021 Mateusz Viste`	4	`* Copyright (C) 2021 Mateusz Viste`
5	`*`	5	`*`
6	`* Permission is hereby granted, free of charge, to any person obtaining a`	6	`* Permission is hereby granted, free of charge, to any person obtaining a`
7	`* copy of this software and associated documentation files (the "Software"),`	7	`* copy of this software and associated documentation files (the "Software"),`
8	`* to deal in the Software without restriction, including without limitation`	8	`* to deal in the Software without restriction, including without limitation`
9	`* the rights to use, copy, modify, merge, publish, distribute, sublicense,`	9	`* the rights to use, copy, modify, merge, publish, distribute, sublicense,`
10	`* and/or sell copies of the Software, and to permit persons to whom the`	10	`* and/or sell copies of the Software, and to permit persons to whom the`
11	`* Software is furnished to do so, subject to the following conditions:`	11	`* Software is furnished to do so, subject to the following conditions:`
12	`*`	12	`*`
13	`* The above copyright notice and this permission notice shall be included in`	13	`* The above copyright notice and this permission notice shall be included in`
14	`* all copies or substantial portions of the Software.`	14	`* all copies or substantial portions of the Software.`
15	`*`	15	`*`
16	`* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR`	16	`* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR`
17	`* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,`	17	`* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,`
18	`* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE`	18	`* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE`
19	`* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER`	19	`* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER`
20	`* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING`	20	`* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING`
21	`* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER`	21	`* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER`
22	`* DEALINGS IN THE SOFTWARE.`	22	`* DEALINGS IN THE SOFTWARE.`
23	`*/`	23	`*/`
24		24
25	`/*`	25	`/*`
26	`* SvarCOM is a command-line interpreter.`	26	`* SvarCOM is a command-line interpreter.`
27	`*`	27	`*`
28	`* a little memory area is allocated as high as possible. it contains:`	28	`* a little memory area is allocated as high as possible. it contains:`
29	`* - a signature (like XMS drivers do)`	29	`* - a signature (like XMS drivers do)`
30	`* - a routine for exec'ing programs`	30	`* - a routine for exec'ing programs`
31	`* - a "last command" buffer for input history`	31	`* - a "last command" buffer for input history`
32	`*`	32	`*`
33	`* when svarcom starts, it tries locating the routine in memory.`	33	`* when svarcom starts, it tries locating the routine in memory.`
34	`*`	34	`*`
35	`* if found:`	35	`* if found:`
36	`* waits for user input and processes it. if execing something is required, set the "next exec" field in routine's memory and quit.`	36	`* waits for user input and processes it. if execing something is required, set the "next exec" field in routine's memory and quit.`
37	`*`	37	`*`
38	`* if not found:`	38	`* if not found:`
39	`* installs it by creating a new PSP, set int 22 vector to the routine, set my "parent PSP" to the routine`	39	`* installs it by creating a new PSP, set int 22 vector to the routine, set my "parent PSP" to the routine`
40	`* and quit.`	40	`* and quit.`
41	`*`	41	`*`
42	`* PSP structure`	42	`* PSP structure`
43	`* http://www.piclist.com/techref/dos/psps.htm`	43	`* http://www.piclist.com/techref/dos/psps.htm`
44	`*`	44	`*`
45	`*`	45	`*`
46	`*`	46	`*`
47	`* === MCB ===`	47	`* === MCB ===`
48	`*`	48	`*`
49	`* each time that DOS allocates memory, it prefixes the allocated memory with`	49	`* each time that DOS allocates memory, it prefixes the allocated memory with`
50	`* a 16-bytes structure called a "Memory Control Block" (MCB). This control`	50	`* a 16-bytes structure called a "Memory Control Block" (MCB). This control`
51	`* block has the following structure:`	51	`* block has the following structure:`
52	`*`	52	`*`
53	`* Offset Size Description`	53	`* Offset Size Description`
54	`* 00h byte 'M' = non-last member of the MCB chain`	54	`* 00h byte 'M' = non-last member of the MCB chain`
55	`* 'Z' = indicates last entry in MCB chain`	55	`* 'Z' = indicates last entry in MCB chain`
56	`* other values cause "Memory Allocation Failure" on exit`	56	`* other values cause "Memory Allocation Failure" on exit`
57	`* 01h word PSP segment address of the owner (Process Id)`	57	`* 01h word PSP segment address of the owner (Process Id)`
58	`* possible values:`	58	`* possible values:`
59	`* 0 = free`	59	`* 0 = free`
60	`* 8 = Allocated by DOS before first user pgm loaded`	60	`* 8 = Allocated by DOS before first user pgm loaded`
61	`* other = Process Id/PSP segment address of owner`	61	`* other = Process Id/PSP segment address of owner`
62	`* 03h word number of paragraphs related to this MCB (excluding MCB)`	62	`* 03h word number of paragraphs related to this MCB (excluding MCB)`
63	`* 05h 11 bytes reserved`	63	`* 05h 11 bytes reserved`
64	`* 10h ... start of actual allocated memory block`	64	`* 10h ... start of actual allocated memory block`
65	`*/`	65	`*/`
66		66
67	`#include <i86.h>`	67	`#include <i86.h>`
68	`#include <dos.h>`	68	`#include <dos.h>`
69	`#include <stdio.h>`	69	`#include <stdio.h>`
70	`#include <stdlib.h>`	70	`#include <stdlib.h>`
71	`#include <string.h>`	71	`#include <string.h>`
72		72
73	`#include <process.h>`	73	`#include <process.h>`
74		74
75	`#include "cmd.h"`	75	`#include "cmd.h"`
76	`#include "env.h"`	76	`#include "env.h"`
77	`#include "helpers.h"`	77	`#include "helpers.h"`
78	`#include "redir.h"`	78	`#include "redir.h"`
79	`#include "rmodinit.h"`	79	`#include "rmodinit.h"`
80		80
81	`#define FLAG_EXEC_AND_QUIT 1`	81	`#define FLAG_EXEC_AND_QUIT 1`
82		82
83	`struct config {`	83	`struct config {`
84	`unsigned char flags;`	84	`unsigned char flags;`
85	`char *execcmd;`	85	`char *execcmd;`
86	`unsigned short envsiz;`	86	`unsigned short envsiz;`
87	`};`	87	`};`
88		88
89		89
90	`/* parses command line the hard way (directly from PSP) */`	90	`/* parses command line the hard way (directly from PSP) */`
91	`static void parse_argv(struct config *cfg) {`	91	`static void parse_argv(struct config *cfg) {`
92	`unsigned short i;`	92	`unsigned short i;`
93	`const unsigned char cmdlinelen = (unsigned char )0x80;`	93	`const unsigned char cmdlinelen = (unsigned char )0x80;`
94	`char cmdline = (char )0x81;`	94	`char cmdline = (char )0x81;`
95		95
96	`memset(cfg, 0, sizeof(*cfg));`	96	`memset(cfg, 0, sizeof(*cfg));`
97		97
98	`/* set a NULL terminator on cmdline */`	98	`/* set a NULL terminator on cmdline */`
99	`cmdline[*cmdlinelen] = 0;`	99	`cmdline[*cmdlinelen] = 0;`
100		100
101	`for (i = 0;;) {`	101	`for (i = 0;;) {`
102		102
103	`/* skip over any leading spaces */`	103	`/* skip over any leading spaces */`
104	`for (;; i++) {`	104	`for (;; i++) {`
105	`if (cmdline[i] == 0) return;`	105	`if (cmdline[i] == 0) return;`
106	`if (cmdline[i] != ' ') break;`	106	`if (cmdline[i] != ' ') break;`
107	`}`	107	`}`
108		108
109	`if (cmdline[i] != '/') {`	109	`if (cmdline[i] != '/') {`
110	`output("Invalid parameter: ");`	110	`output("Invalid parameter: ");`
111	`outputnl(cmdline + i);`	111	`outputnl(cmdline + i);`
112	`/* exit(1); */`	112	`/* exit(1); */`
113	`} else {`	113	`} else {`
114	`i++; /* skip the slash */`	114	`i++; /* skip the slash */`
115	`switch (cmdline[i]) {`	115	`switch (cmdline[i]) {`
116	`case 'c': /* /C = execute command and quit */`	116	`case 'c': /* /C = execute command and quit */`
117	`case 'C':`	117	`case 'C':`
118	`cfg->flags \|= FLAG_EXEC_AND_QUIT;`	118	`cfg->flags \|= FLAG_EXEC_AND_QUIT;`
119	`/* FALLTHRU */`	119	`/* FALLTHRU */`
120	`case 'k': /* /K = execute command and keep running */`	120	`case 'k': /* /K = execute command and keep running */`
121	`case 'K':`	121	`case 'K':`
122	`cfg->execcmd = cmdline + i + 1;`	122	`cfg->execcmd = cmdline + i + 1;`
123	`return;`	123	`return;`
124		124
125	`case 'e': /* preset the initial size of the environment block */`	125	`case 'e': /* preset the initial size of the environment block */`
126	`case 'E':`	126	`case 'E':`
127	`i++;`	127	`i++;`
128	`if (cmdline[i] == ':') i++; /* could be /E:size */`	128	`if (cmdline[i] == ':') i++; /* could be /E:size */`
129	`atous(&(cfg->envsiz), cmdline + i);`	129	`atous(&(cfg->envsiz), cmdline + i);`
130	`if (cfg->envsiz < 64) cfg->envsiz = 0;`	130	`if (cfg->envsiz < 64) cfg->envsiz = 0;`
131	`break;`	131	`break;`
132		132
-		133	`case '?':`
-		134	`outputnl("Starts the SvarCOM command interpreter");`
-		135	`outputnl("");`
-		136	`outputnl("COMMAND /E:nnn [/[C\|K] command]");`
-		137	`outputnl("");`
-		138	`outputnl("/E:nnn Sets the environment size to nnn bytes");`
-		139	`outputnl("/C Executes the specified command and returns");`
-		140	`outputnl("/K Executes the specified command and continues running");`
-		141	`exit(1);`
-		142	`break;`
-		143
133	`default:`	144	`default:`
134	`output("Invalid switch:");`	145	`output("Invalid switch:");`
135	`output(" ");`	146	`output(" ");`
136	`outputnl(cmdline + i);`	147	`outputnl(cmdline + i);`
137	`exit(1);`	148	`exit(1);`
138	`break;`	149	`break;`
139	`}`	150	`}`
140	`}`	151	`}`
141		152
142	`/* move to next argument or quit processing if end of cmdline */`	153	`/* move to next argument or quit processing if end of cmdline */`
143	`for (i++; (cmdline[i] != 0) && (cmdline[i] != ' ') && (cmdline[i] != '/'); i++);`	154	`for (i++; (cmdline[i] != 0) && (cmdline[i] != ' ') && (cmdline[i] != '/'); i++);`
144		155
145	`}`	156	`}`
146	`}`	157	`}`
147		158
148		159
149	`static void buildprompt(char *s, unsigned short envseg) {`	160	`static void buildprompt(char *s, unsigned short envseg) {`
150	`/* locate the prompt variable or use the default pattern */`	161	`/* locate the prompt variable or use the default pattern */`
151	`const char far *fmt = env_lookup_val(envseg, "PROMPT");`	162	`const char far *fmt = env_lookup_val(envseg, "PROMPT");`
152	`if ((fmt == NULL) \|\| (fmt == 0)) fmt = "$p$g"; / fallback to default if empty */`	163	`if ((fmt == NULL) \|\| (fmt == 0)) fmt = "$p$g"; / fallback to default if empty */`
153	`/* build the prompt string based on pattern */`	164	`/* build the prompt string based on pattern */`
154	`for (; *fmt != 0; fmt++) {`	165	`for (; *fmt != 0; fmt++) {`
155	`if (*fmt != '$') {`	166	`if (*fmt != '$') {`
156	`s = fmt;`	167	`s = fmt;`
157	`s++;`	168	`s++;`
158	`continue;`	169	`continue;`
159	`}`	170	`}`
160	`/* escape code ($P, etc) */`	171	`/* escape code ($P, etc) */`
161	`fmt++;`	172	`fmt++;`
162	`switch (*fmt) {`	173	`switch (*fmt) {`
163	`case 'Q': /* $Q = = (equal sign) */`	174	`case 'Q': /* $Q = = (equal sign) */`
164	`case 'q':`	175	`case 'q':`
165	`*s = '=';`	176	`*s = '=';`
166	`s++;`	177	`s++;`
167	`break;`	178	`break;`
168	`case '$': /* $$ = $ (dollar sign) */`	179	`case '$': /* $$ = $ (dollar sign) */`
169	`*s = '$';`	180	`*s = '$';`
170	`s++;`	181	`s++;`
171	`break;`	182	`break;`
172	`case 'T': /* $t = current time */`	183	`case 'T': /* $t = current time */`
173	`case 't':`	184	`case 't':`
174	`s += sprintf(s, "00:00"); /* TODO */`	185	`s += sprintf(s, "00:00"); /* TODO */`
175	`break;`	186	`break;`
176	`case 'D': /* $D = current date */`	187	`case 'D': /* $D = current date */`
177	`case 'd':`	188	`case 'd':`
178	`s += sprintf(s, "1985-07-29"); /* TODO */`	189	`s += sprintf(s, "1985-07-29"); /* TODO */`
179	`break;`	190	`break;`
180	`case 'P': /* $P = current drive and path */`	191	`case 'P': /* $P = current drive and path */`
181	`case 'p':`	192	`case 'p':`
182	`_asm {`	193	`_asm {`
183	`mov ah, 0x19 /* DOS 1+ - GET CURRENT DRIVE */`	194	`mov ah, 0x19 /* DOS 1+ - GET CURRENT DRIVE */`
184	`int 0x21`	195	`int 0x21`
185	`mov bx, s`	196	`mov bx, s`
186	`mov [bx], al /* AL = drive (00 = A:, 01 = B:, etc */`	197	`mov [bx], al /* AL = drive (00 = A:, 01 = B:, etc */`
187	`}`	198	`}`
188	`*s += 'A';`	199	`*s += 'A';`
189	`s++;`	200	`s++;`
190	`*s = ':';`	201	`*s = ':';`
191	`s++;`	202	`s++;`
192	`*s = '\\';`	203	`*s = '\\';`
193	`s++;`	204	`s++;`
194	`_asm {`	205	`_asm {`
195	`mov ah, 0x47 /* DOS 2+ - CWD - GET CURRENT DIRECTORY */`	206	`mov ah, 0x47 /* DOS 2+ - CWD - GET CURRENT DIRECTORY */`
196	`xor dl,dl /* DL = drive number (00h = default, 01h = A:, etc) */`	207	`xor dl,dl /* DL = drive number (00h = default, 01h = A:, etc) */`
197	`mov si, s /* DS:SI -> 64-byte buffer for ASCIZ pathname */`	208	`mov si, s /* DS:SI -> 64-byte buffer for ASCIZ pathname */`
198	`int 0x21`	209	`int 0x21`
199	`}`	210	`}`
200	`while (s != 0) s++; / move ptr forward to end of pathname */`	211	`while (s != 0) s++; / move ptr forward to end of pathname */`
201	`break;`	212	`break;`
202	`case 'V': /* $V = DOS version number */`	213	`case 'V': /* $V = DOS version number */`
203	`case 'v':`	214	`case 'v':`
204	`s += sprintf(s, "VER"); /* TODO */`	215	`s += sprintf(s, "VER"); /* TODO */`
205	`break;`	216	`break;`
206	`case 'N': /* $N = current drive */`	217	`case 'N': /* $N = current drive */`
207	`case 'n':`	218	`case 'n':`
208	`_asm {`	219	`_asm {`
209	`mov ah, 0x19 /* DOS 1+ - GET CURRENT DRIVE */`	220	`mov ah, 0x19 /* DOS 1+ - GET CURRENT DRIVE */`
210	`int 0x21`	221	`int 0x21`
211	`mov bx, s`	222	`mov bx, s`
212	`mov [bx], al /* AL = drive (00 = A:, 01 = B:, etc */`	223	`mov [bx], al /* AL = drive (00 = A:, 01 = B:, etc */`
213	`}`	224	`}`
214	`*s += 'A';`	225	`*s += 'A';`
215	`s++;`	226	`s++;`
216	`break;`	227	`break;`
217	`case 'G': /* $G = > (greater-than sign) */`	228	`case 'G': /* $G = > (greater-than sign) */`
218	`case 'g':`	229	`case 'g':`
219	`*s = '>';`	230	`*s = '>';`
220	`s++;`	231	`s++;`
221	`break;`	232	`break;`
222	`case 'L': /* $L = < (less-than sign) */`	233	`case 'L': /* $L = < (less-than sign) */`
223	`case 'l':`	234	`case 'l':`
224	`*s = '<';`	235	`*s = '<';`
225	`s++;`	236	`s++;`
226	`break;`	237	`break;`
227	`case 'B': /* $B = \| (pipe) */`	238	`case 'B': /* $B = \| (pipe) */`
228	`case 'b':`	239	`case 'b':`
229	`*s = '\|';`	240	`*s = '\|';`
230	`s++;`	241	`s++;`
231	`break;`	242	`break;`
232	`case 'H': /* $H = backspace (erases previous character) */`	243	`case 'H': /* $H = backspace (erases previous character) */`
233	`case 'h':`	244	`case 'h':`
234	`*s = '\b';`	245	`*s = '\b';`
235	`s++;`	246	`s++;`
236	`break;`	247	`break;`
237	`case 'E': /* $E = Escape code (ASCII 27) */`	248	`case 'E': /* $E = Escape code (ASCII 27) */`
238	`case 'e':`	249	`case 'e':`
239	`*s = 27;`	250	`*s = 27;`
240	`s++;`	251	`s++;`
241	`break;`	252	`break;`
242	`case '_': /* $_ = CR+LF */`	253	`case '_': /* $_ = CR+LF */`
243	`*s = '\r';`	254	`*s = '\r';`
244	`s++;`	255	`s++;`
245	`*s = '\n';`	256	`*s = '\n';`
246	`s++;`	257	`s++;`
247	`break;`	258	`break;`
248	`}`	259	`}`
249	`}`	260	`}`
250	`*s = '$';`	261	`*s = '$';`
251	`}`	262	`}`
252		263
253		264
254	`static void run_as_external(const char far *cmdline) {`	265	`static void run_as_external(const char far *cmdline) {`
255	`char buff[256];`	266	`char buff[256];`
256	`char const *argvlist[256];`	267	`char const *argvlist[256];`
257	`int i, n;`	268	`int i, n;`
258	`/* copy buffer to a near var (incl. trailing CR), insert a space before`	269	`/* copy buffer to a near var (incl. trailing CR), insert a space before`
259	`every slash to make sure arguments are well separated */`	270	`every slash to make sure arguments are well separated */`
260	`n = 0;`	271	`n = 0;`
261	`i = 0;`	272	`i = 0;`
262	`for (;;) {`	273	`for (;;) {`
263	`if (cmdline[i] == '/') buff[n++] = ' ';`	274	`if (cmdline[i] == '/') buff[n++] = ' ';`
264	`buff[n++] = cmdline[i++];`	275	`buff[n++] = cmdline[i++];`
265	`if (buff[n] == 0) break;`	276	`if (buff[n] == 0) break;`
266	`}`	277	`}`
267		278
268	`cmd_explode(buff, cmdline, argvlist);`	279	`cmd_explode(buff, cmdline, argvlist);`
269		280
270	`/* for (i = 0; argvlist[i] != NULL; i++) printf("arg #%d = '%s'\r\n", i, argvlist[i]); */`	281	`/* for (i = 0; argvlist[i] != NULL; i++) printf("arg #%d = '%s'\r\n", i, argvlist[i]); */`
271		282
272	`/* must be an external command then. this call should never return, unless`	283	`/* must be an external command then. this call should never return, unless`
273	`* the other program failed to be executed. */`	284	`* the other program failed to be executed. */`
274	`execvp(argvlist[0], argvlist);`	285	`execvp(argvlist[0], argvlist);`
275	`}`	286	`}`
276		287
277		288
278	`static void set_comspec_to_self(unsigned short envseg) {`	289	`static void set_comspec_to_self(unsigned short envseg) {`
279	`unsigned short psp_envseg = (void )(0x2c); /* pointer to my env segment field in the PSP */`	290	`unsigned short psp_envseg = (void )(0x2c); /* pointer to my env segment field in the PSP */`
280	`char far myenv = MK_FP(psp_envseg, 0);`	291	`char far myenv = MK_FP(psp_envseg, 0);`
281	`unsigned short varcount;`	292	`unsigned short varcount;`
282	`char buff[256] = "COMSPEC=";`	293	`char buff[256] = "COMSPEC=";`
283	`char *buffptr = buff + 8;`	294	`char *buffptr = buff + 8;`
284	`/* who am i? look into my own environment, at the end of it should be my EXEPATH string */`	295	`/* who am i? look into my own environment, at the end of it should be my EXEPATH string */`
285	`while (*myenv != 0) {`	296	`while (*myenv != 0) {`
286	`/* consume a NULL-terminated string */`	297	`/* consume a NULL-terminated string */`
287	`while (*myenv != 0) myenv++;`	298	`while (*myenv != 0) myenv++;`
288	`/* move to next string */`	299	`/* move to next string */`
289	`myenv++;`	300	`myenv++;`
290	`}`	301	`}`
291	`/* get next word, if 1 then EXEPATH follows */`	302	`/* get next word, if 1 then EXEPATH follows */`
292	`myenv++;`	303	`myenv++;`
293	`varcount = *myenv;`	304	`varcount = *myenv;`
294	`myenv++;`	305	`myenv++;`
295	`varcount \|= (*myenv << 8);`	306	`varcount \|= (*myenv << 8);`
296	`myenv++;`	307	`myenv++;`
297	`if (varcount != 1) return; /* NO EXEPATH FOUND */`	308	`if (varcount != 1) return; /* NO EXEPATH FOUND */`
298	`while (*myenv != 0) {`	309	`while (*myenv != 0) {`
299	`buffptr = myenv;`	310	`buffptr = myenv;`
300	`buffptr++;`	311	`buffptr++;`
301	`myenv++;`	312	`myenv++;`
302	`}`	313	`}`
303	`*buffptr = 0;`	314	`*buffptr = 0;`
304	`/* printf("EXEPATH: '%s'\r\n", buff); */`	315	`/* printf("EXEPATH: '%s'\r\n", buff); */`
305	`env_setvar(envseg, buff);`	316	`env_setvar(envseg, buff);`
306	`}`	317	`}`
307		318
308		319
309	`int main(void) {`	320	`int main(void) {`
310	`static struct config cfg;`	321	`static struct config cfg;`
311	`static unsigned short rmod_seg;`	322	`static unsigned short rmod_seg;`
312	`static unsigned short far *rmod_envseg;`	323	`static unsigned short far *rmod_envseg;`
313	`static unsigned short far *lastexitcode;`	324	`static unsigned short far *lastexitcode;`
314	`static unsigned char BUFFER[4096];`	325	`static unsigned char BUFFER[4096];`
315		326
316	`parse_argv(&cfg);`	327	`parse_argv(&cfg);`
317		328
318	`rmod_seg = rmod_find();`	329	`rmod_seg = rmod_find();`
319	`if (rmod_seg == 0xffff) {`	330	`if (rmod_seg == 0xffff) {`
320	`rmod_seg = rmod_install(cfg.envsiz);`	331	`rmod_seg = rmod_install(cfg.envsiz);`
321	`if (rmod_seg == 0xffff) {`	332	`if (rmod_seg == 0xffff) {`
322	`outputnl("ERROR: rmod_install() failed");`	333	`outputnl("ERROR: rmod_install() failed");`
323	`return(1);`	334	`return(1);`
324	`}`	335	`}`
325	`/* printf("rmod installed at seg 0x%04X\r\n", rmod_seg); */`	336	`/* printf("rmod installed at seg 0x%04X\r\n", rmod_seg); */`
326	`} else {`	337	`} else {`
327	`/* printf("rmod found at seg 0x%04x\r\n", rmod_seg); */`	338	`/* printf("rmod found at seg 0x%04x\r\n", rmod_seg); */`
328	`}`	339	`}`
329		340
330	`rmod_envseg = MK_FP(rmod_seg, RMOD_OFFSET_ENVSEG);`	341	`rmod_envseg = MK_FP(rmod_seg, RMOD_OFFSET_ENVSEG);`
331	`lastexitcode = MK_FP(rmod_seg, RMOD_OFFSET_LEXITCODE);`	342	`lastexitcode = MK_FP(rmod_seg, RMOD_OFFSET_LEXITCODE);`
332		343
333	`/* make COMPSEC point to myself */`	344	`/* make COMPSEC point to myself */`
334	`set_comspec_to_self(*rmod_envseg);`	345	`set_comspec_to_self(*rmod_envseg);`
335		346
336	`/* {`	347	`/* {`
337	`unsigned short envsiz;`	348	`unsigned short envsiz;`
338	`unsigned short far sizptr = MK_FP(rmod_envseg - 1, 3);`	349	`unsigned short far sizptr = MK_FP(rmod_envseg - 1, 3);`
339	`envsiz = *sizptr;`	350	`envsiz = *sizptr;`
340	`envsiz *= 16;`	351	`envsiz *= 16;`
341	`printf("rmod_inpbuff at %04X:%04X, env_seg at %04X:0000 (env_size = %u bytes)\r\n", rmod_seg, RMOD_OFFSET_INPBUFF, *rmod_envseg, envsiz);`	352	`printf("rmod_inpbuff at %04X:%04X, env_seg at %04X:0000 (env_size = %u bytes)\r\n", rmod_seg, RMOD_OFFSET_INPBUFF, *rmod_envseg, envsiz);`
342	`}*/`	353	`}*/`
343		354
344	`do {`	355	`do {`
345	`char far *cmdline = MK_FP(rmod_seg, RMOD_OFFSET_INPBUFF + 2);`	356	`char far *cmdline = MK_FP(rmod_seg, RMOD_OFFSET_INPBUFF + 2);`
346	`unsigned char far *echostatus = MK_FP(rmod_seg, RMOD_OFFSET_ECHOFLAG);`	357	`unsigned char far *echostatus = MK_FP(rmod_seg, RMOD_OFFSET_ECHOFLAG);`
347		358
348	`/* (re)load translation strings if needed */`	359	`/* (re)load translation strings if needed */`
349	`nls_langreload(BUFFER, *rmod_envseg);`	360	`nls_langreload(BUFFER, *rmod_envseg);`
350		361
351	`/* skip user input if I have a command to exec (/C or /K) */`	362	`/* skip user input if I have a command to exec (/C or /K) */`
352	`if (cfg.execcmd != NULL) {`	363	`if (cfg.execcmd != NULL) {`
353	`cmdline = cfg.execcmd;`	364	`cmdline = cfg.execcmd;`
354	`cfg.execcmd = NULL;`	365	`cfg.execcmd = NULL;`
355	`goto EXEC_CMDLINE;`	366	`goto EXEC_CMDLINE;`
356	`}`	367	`}`
357		368
358	`if (echostatus != 0) outputnl(""); / terminate the previous command with a CR/LF */`	369	`if (echostatus != 0) outputnl(""); / terminate the previous command with a CR/LF */`
359		370
360	`SKIP_NEWLINE:`	371	`SKIP_NEWLINE:`
361		372
362	`/* print shell prompt (only if ECHO is enabled) */`	373	`/* print shell prompt (only if ECHO is enabled) */`
363	`if (*echostatus != 0) {`	374	`if (*echostatus != 0) {`
364	`char *promptptr = BUFFER;`	375	`char *promptptr = BUFFER;`
365	`buildprompt(promptptr, *rmod_envseg);`	376	`buildprompt(promptptr, *rmod_envseg);`
366	`_asm {`	377	`_asm {`
367	`push ax`	378	`push ax`
368	`push dx`	379	`push dx`
369	`mov ah, 0x09`	380	`mov ah, 0x09`
370	`mov dx, promptptr`	381	`mov dx, promptptr`
371	`int 0x21`	382	`int 0x21`
372	`pop dx`	383	`pop dx`
373	`pop ax`	384	`pop ax`
374	`}`	385	`}`
375	`}`	386	`}`
376		387
377	`/* revert input history terminator to \r */`	388	`/* revert input history terminator to \r */`
378	`if (cmdline[-1] != 0) {`	389	`if (cmdline[-1] != 0) {`
379	`cmdline[(unsigned short)(cmdline[-1])] = '\r';`	390	`cmdline[(unsigned short)(cmdline[-1])] = '\r';`
380	`}`	391	`}`
381		392
382	`/* wait for user input */`	393	`/* wait for user input */`
383	`_asm {`	394	`_asm {`
384	`push ax`	395	`push ax`
385	`push bx`	396	`push bx`
386	`push cx`	397	`push cx`
387	`push dx`	398	`push dx`
388	`push ds`	399	`push ds`
389		400
390	`/* is DOSKEY support present? (INT 2Fh, AX=4800h, returns non-zero in AL if present) */`	401	`/* is DOSKEY support present? (INT 2Fh, AX=4800h, returns non-zero in AL if present) */`
391	`mov ax, 0x4800`	402	`mov ax, 0x4800`
392	`int 0x2f`	403	`int 0x2f`
393	`mov bl, al /* save doskey status in BL */`	404	`mov bl, al /* save doskey status in BL */`
394		405
395	`/* set up buffered input */`	406	`/* set up buffered input */`
396	`mov ax, rmod_seg`	407	`mov ax, rmod_seg`
397	`push ax`	408	`push ax`
398	`pop ds`	409	`pop ds`
399	`mov dx, RMOD_OFFSET_INPBUFF`	410	`mov dx, RMOD_OFFSET_INPBUFF`
400		411
401	`/* execute either DOS input or DOSKEY */`	412	`/* execute either DOS input or DOSKEY */`
402	`test bl, bl /* zf set if no DOSKEY present */`	413	`test bl, bl /* zf set if no DOSKEY present */`
403	`jnz DOSKEY`	414	`jnz DOSKEY`
404		415
405	`mov ah, 0x0a`	416	`mov ah, 0x0a`
406	`int 0x21`	417	`int 0x21`
407	`jmp short DONE`	418	`jmp short DONE`
408		419
409	`DOSKEY:`	420	`DOSKEY:`
410	`mov ax, 0x4810`	421	`mov ax, 0x4810`
411	`int 0x2f`	422	`int 0x2f`
412		423
413	`DONE:`	424	`DONE:`
414	`/* terminate command with a CR/LF */`	425	`/* terminate command with a CR/LF */`
415	`mov ah, 0x02 /* display character in dl */`	426	`mov ah, 0x02 /* display character in dl */`
416	`mov dl, 0x0d`	427	`mov dl, 0x0d`
417	`int 0x21`	428	`int 0x21`
418	`mov dl, 0x0a`	429	`mov dl, 0x0a`
419	`int 0x21`	430	`int 0x21`
420		431
421	`pop ds`	432	`pop ds`
422	`pop dx`	433	`pop dx`
423	`pop cx`	434	`pop cx`
424	`pop bx`	435	`pop bx`
425	`pop ax`	436	`pop ax`
426	`}`	437	`}`
427		438
428	`/* if nothing entered, loop again (but without appending an extra CR/LF) */`	439	`/* if nothing entered, loop again (but without appending an extra CR/LF) */`
429	`if (cmdline[-1] == 0) goto SKIP_NEWLINE;`	440	`if (cmdline[-1] == 0) goto SKIP_NEWLINE;`
430		441
431	`/* replace \r by a zero terminator */`	442	`/* replace \r by a zero terminator */`
432	`cmdline[(unsigned char)(cmdline[-1])] = 0;`	443	`cmdline[(unsigned char)(cmdline[-1])] = 0;`
433		444
434	`/* I jump here when I need to exec an initial command (/C or /K) */`	445	`/* I jump here when I need to exec an initial command (/C or /K) */`
435	`EXEC_CMDLINE:`	446	`EXEC_CMDLINE:`
436		447
437	`/* move pointer forward to skip over any leading spaces */`	448	`/* move pointer forward to skip over any leading spaces */`
438	`while (*cmdline == ' ') cmdline++;`	449	`while (*cmdline == ' ') cmdline++;`
439		450
440	`/* update rmod's ptr to COMPSPEC so it is always up to date */`	451	`/* update rmod's ptr to COMPSPEC so it is always up to date */`
441	`rmod_updatecomspecptr(rmod_seg, *rmod_envseg);`	452	`rmod_updatecomspecptr(rmod_seg, *rmod_envseg);`
442		453
443	`/* handle redirections (if any) */`	454	`/* handle redirections (if any) */`
444	`if (redir_parsecmd(cmdline, BUFFER) != 0) {`	455	`if (redir_parsecmd(cmdline, BUFFER) != 0) {`
445	`outputnl("");`	456	`outputnl("");`
446	`continue;`	457	`continue;`
447	`}`	458	`}`
448		459
449	`/* try matching (and executing) an internal command */`	460	`/* try matching (and executing) an internal command */`
450	`if (cmd_process(rmod_seg, *rmod_envseg, cmdline, BUFFER) >= -1) {`	461	`if (cmd_process(rmod_seg, *rmod_envseg, cmdline, BUFFER) >= -1) {`
451	`/* internal command executed */`	462	`/* internal command executed */`
452	`redir_revert(); /* revert stdout (in case it was redirected) */`	463	`redir_revert(); /* revert stdout (in case it was redirected) */`
453	`continue;`	464	`continue;`
454	`}`	465	`}`
455		466
456	`/* if here, then this was not an internal command */`	467	`/* if here, then this was not an internal command */`
457	`run_as_external(cmdline);`	468	`run_as_external(cmdline);`
458		469
459	`/* revert stdout (in case it was redirected) */`	470	`/* revert stdout (in case it was redirected) */`
460	`redir_revert();`	471	`redir_revert();`
461		472
462	`/* execvp() replaces the current process by the new one`	473	`/* execvp() replaces the current process by the new one`
463	`if I am still alive then external command failed to execute */`	474	`if I am still alive then external command failed to execute */`
464	`outputnl("Bad command or file name");`	475	`outputnl("Bad command or file name");`
465		476
466	`} while ((cfg.flags & FLAG_EXEC_AND_QUIT) == 0);`	477	`} while ((cfg.flags & FLAG_EXEC_AND_QUIT) == 0);`
467		478
468	`return(0);`	479	`return(0);`
469	`}`	480	`}`
470		481

Subversion Repositories SvarDOS

(root)/svarcom/trunk/command.c @ 1202 – Rev 443 → 444