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


/* This file is part of the SvarCOM project and is published under the terms
 * of the MIT license.
 *
 * Copyright (C) 2021-2022 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.
 */
 
/* entry point for internal commands, it matches internal commands and
 * executes them.
 *
 * returns one of the following values:
 *   CMD_OK               command executed successfully
 *   CMD_FAIL             command ended in error
 *   CMD_CHANGED          command-line has been modified (used by IF)
 *   CMD_CHANGED_BY_CALL  command-line has been modified by CALL
 *   CMD_NOTFOUND         command unrecognized
 */
 
#include <i86.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
 
#include "svarlang.lib/svarlang.h"
 
#include "env.h"
#include "helpers.h"
#include "redir.h"
#include "rmodinit.h"
#include "sayonara.h"
 
#include "cmd.h"
 
 
struct cmd_funcparam {
  int argc;                 /* number of arguments */
  const char *argv[128];    /* pointers to each argument */
  char argvbuf[256];        /* buffer that hold data pointed out by argv[] */
  unsigned short env_seg;   /* segment of environment block */
  struct rmod_props far *rmod; /* rmod settings */
  unsigned short argoffset; /* offset of cmdline where first argument starts */
  const char *cmdline;      /* original cmdline (terminated by a NULL) */
  unsigned short BUFFERSZ;  /* avail space in BUFFER */
  char BUFFER[1];           /* a buffer for whatever is needed (must be last) */
};
 
/* scans argv for the presence of a "/?" parameter. returns 1 if found, 0 otherwise */
static int cmd_ishlp(const struct cmd_funcparam *p) {
  int i;
  for (i = 0; i < p->argc; i++) {
    if ((p->argv[i][0] == '/') && (p->argv[i][1] == '?')) return(1);
  }
  return(0);
}
 
 
#include "cmd/break.c"
#include "cmd/call.c"
#include "cmd/cd.c"
#include "cmd/chcp.c"
#include "cmd/cls.c"
#include "cmd/copy.c"
#include "cmd/ctty.c"
#include "cmd/date.c"
#include "cmd/del.c"
#include "cmd/for.c"
#include "cmd/goto.c"
#include "cmd/if.c"
#include "cmd/vol.c"     /* must be included before dir.c due to dependency */
#include "cmd/dir.c"
#include "cmd/echo.c"
#include "cmd/exit.c"
#include "cmd/loadhigh.c"
#include "cmd/ln.c"
#include "cmd/mkdir.c"
#include "cmd/path.c"
#include "cmd/pause.c"
#include "cmd/prompt.c"
#include "cmd/rem.c"
#include "cmd/rename.c"
#include "cmd/rmdir.c"
#include "cmd/set.c"
#include "cmd/shift.c"
#include "cmd/time.c"
#include "cmd/truename.c"
#include "cmd/type.c"
#include "cmd/ver.c"
#include "cmd/verify.c"
 
 
struct CMD_ID {
  const char *cmd;
  enum cmd_result (*func_ptr)(struct cmd_funcparam *); /* pointer to handling function */
};
 
const struct CMD_ID INTERNAL_CMDS[] = {
  {"BREAK",   cmd_break},
  {"CALL",    cmd_call},
  {"CD",      cmd_cd},
  {"CHCP",    cmd_chcp},
  {"CHDIR",   cmd_cd},
  {"CLS",     cmd_cls},
  {"COPY",    cmd_copy},
  {"CTTY",    cmd_ctty},
  {"DATE",    cmd_date},
  {"DEL",     cmd_del},
  {"DIR",     cmd_dir},
  {"ECHO",    cmd_echo},
  {"ERASE",   cmd_del},
  {"EXIT",    cmd_exit},
  {"FOR",     cmd_for},
  {"GOTO",    cmd_goto},
  {"IF",      cmd_if},
  {"LH",      cmd_loadhigh},
  {"LN",      cmd_ln},
  {"LOADHIGH",cmd_loadhigh},
  {"MD",      cmd_mkdir},
  {"MKDIR",   cmd_mkdir},
  {"PAUSE",   cmd_pause},
  {"PATH",    cmd_path},
  {"PROMPT",  cmd_prompt},
  {"RD",      cmd_rmdir},
  {"REM",     cmd_rem},
  {"REN",     cmd_rename},
  {"RENAME",  cmd_rename},
  {"RMDIR",   cmd_rmdir},
  {"SET",     cmd_set},
  {"SHIFT",   cmd_shift},
  {"TIME",    cmd_time},
  {"TRUENAME",cmd_truename},
  {"TYPE",    cmd_type},
  {"VER",     cmd_ver},
  {"VERIFY",  cmd_verify},
  {"VOL",     cmd_vol},
  {NULL,      NULL}
};
 
 
/* NULL if cmdline is not matching an internal command, otherwise returns a
 * pointer to a CMD_ID struct */
static const struct CMD_ID *cmd_match(const char *cmdline, unsigned short *argoffset) {
  unsigned short i;
  char buff[10];
 
  /* copy command to buffer, until space, NULL, tab, return, dot, slash or backslash */
  for (i = 0; i < 9; i++) {
    if (cmdline[i] == ' ') break;
    if (cmdline[i] == 0) break;
    if (cmdline[i] == '\t') break;
    if (cmdline[i] == '\r') break;
    if (cmdline[i] == '.') break;
    if (cmdline[i] == '/') break;
    if (cmdline[i] == '\\') break;
    buff[i] = cmdline[i];
  }
  buff[i] = 0;
 
  /* advance to nearest non-space to find where arguments start */
  while (cmdline[i] == ' ') i++;
  *argoffset = i;
 
  /* try matching an internal command */
  for (i = 0; INTERNAL_CMDS[i].cmd != NULL; i++) {
    /*printf("imatch(%s,%s)\r\n", buff, INTERNAL_CMDS[i].cmd); */
    if (imatch(buff, INTERNAL_CMDS[i].cmd)) {
      /*printf("match cmd i=%u (buff=%s)\r\n", i, buff);*/
      return(&(INTERNAL_CMDS[i]));
    }
  }
 
  return(NULL); /* command is not recognized as internal */
}
 
 
/* explodes a command into an array of arguments where last arg is NULL.
 * if argvlist is not NULL, it will be filled with pointers that point to buff
 * locations. buff is filled with all the arguments, each argument being
 * zero-separated. buff is terminated with an empty argument to mark the end
 * of arguments.
 * returns number of args */
unsigned short cmd_explode(char *buff, const char far *s, char const **argvlist) {
  int si = 0, argc = 0, i = 0;
  for (;;) {
    /* skip to next non-space character */
    while (s[si] == ' ') si++;
    /* end of string? */
    if (s[si] == 0) break;
    /* set argv ptr */
    if (argvlist) argvlist[argc] = buff + i;
    argc++;
    /* find next arg delimiter (spc, null, slash or plus) while copying arg to local buffer */
    do {
      buff[i++] = s[si++];
    } while (s[si] != ' ' && s[si] != 0 && s[si] != '/' && s[si] != '+');
    buff[i++] = 0;
    /* is this end of string? */
    if (s[si] == 0) break;
  }
  buff[i] = 0; /* terminate with one extra zero to tell "this is the end of list" */
  if (argvlist) argvlist[argc] = NULL;
  return(argc);
}
 
 
enum cmd_result cmd_process(struct rmod_props far *rmod, unsigned short env_seg, const char *cmdline, void *BUFFER, unsigned short BUFFERSZ, const struct redir_data *redir, unsigned char delstdin) {
  const struct CMD_ID *cmdptr;
  unsigned short argoffset;
  enum cmd_result cmdres;
  struct cmd_funcparam *p = (void *)BUFFER;
  p->BUFFERSZ = BUFFERSZ - sizeof(*p);
 
  /* special case: is this a drive change? (like "E:") */
  if ((cmdline[0] != 0) && (cmdline[1] == ':') && ((cmdline[2] == ' ') || (cmdline[2] == 0))) {
    if (((cmdline[0] >= 'a') && (cmdline[0] <= 'z')) || ((cmdline[0] >= 'A') && (cmdline[0] <= 'Z'))) {
      unsigned char drive = cmdline[0];
      unsigned char curdrive = 0;
      if (drive >= 'a') {
        drive -= 'a';
      } else {
        drive -= 'A';
      }
      _asm {
        push ax
        push dx
        mov ah, 0x0e     /* DOS 1+ - SELECT DEFAULT DRIVE */
        mov dl, drive    /* DL = new default drive (00h = A:, 01h = B:, etc) */
        int 0x21
        mov ah, 0x19     /* DOS 1+ - GET CURRENT DRIVE */
        int 0x21
        mov curdrive, al /* cur drive (0=A, 1=B, etc) */
        pop dx
        pop ax
      }
      if (curdrive == drive) return(CMD_OK);
      nls_outputnl_doserr(0x0f);
      return(CMD_FAIL);
    }
  }
 
  /* try matching an internal command */
  cmdptr = cmd_match(cmdline, &argoffset);
  if (cmdptr == NULL) return(CMD_NOTFOUND); /* command is not recognized as internal */
 
  /* printf("recognized internal command: '%s', tail of command at offset %u\r\n", cmdptr->cmd, argoffset); */
 
  /* apply redirections (if any) */
  if (redir_apply(redir) != 0) return(CMD_FAIL);
 
  /* prepare function parameters and feed it to the cmd handling function */
  p->argc = cmd_explode(p->argvbuf, cmdline + argoffset, p->argv);
  p->env_seg = env_seg;
  p->rmod = rmod;
  p->argoffset = argoffset;
  p->cmdline = cmdline;
 
  cmdres = (cmdptr->func_ptr)(p);
 
  /* cancel redirections */
  redir_revert();
 
  /* delete stdin temporary file */
  if (delstdin) {
    const char *fname = redir->stdinfile;
    unsigned short doserr = 0;
    _asm {
      push ax
      push dx
      mov ah, 0x41  /* delete a file */
      mov dx, fname /* DS:DX - filename to delete */
      int 0x21
      jnc DONE
      mov doserr, ax
      DONE:
      pop dx
      pop ax
    }
    if (doserr) {
      output(fname);
      output(": ");
      nls_outputnl_doserr(doserr);
    }
  }
 
  return(cmdres);
}
 

Rev 1045	Rev 1090
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) 2021-2022 Mateusz Viste`	4	`* Copyright (C) 2021-2022 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	`/* entry point for internal commands, it matches internal commands and`	25	`/* entry point for internal commands, it matches internal commands and`
26	`* executes them.`	26	`* executes them.`
27	`*`	27	`*`
28	`* returns one of the following values:`	28	`* returns one of the following values:`
29	`* CMD_OK command executed successfully`	29	`* CMD_OK command executed successfully`
30	`* CMD_FAIL command ended in error`	30	`* CMD_FAIL command ended in error`
31	`* CMD_CHANGED command-line has been modified (used by IF)`	31	`* CMD_CHANGED command-line has been modified (used by IF)`
32	`* CMD_CHANGED_BY_CALL command-line has been modified by CALL`	32	`* CMD_CHANGED_BY_CALL command-line has been modified by CALL`
33	`* CMD_NOTFOUND command unrecognized`	33	`* CMD_NOTFOUND command unrecognized`
34	`*/`	34	`*/`
35		35
36	`#include <i86.h>`	36	`#include <i86.h>`
37	`#include <stdio.h>`	37	`#include <stdio.h>`
38	`#include <stdlib.h>`	38	`#include <stdlib.h>`
39	`#include <string.h>`	39	`#include <string.h>`
40		40
41	`#include "svarlang.lib/svarlang.h"`	41	`#include "svarlang.lib/svarlang.h"`
42		42
43	`#include "env.h"`	43	`#include "env.h"`
44	`#include "helpers.h"`	44	`#include "helpers.h"`
45	`#include "redir.h"`	45	`#include "redir.h"`
46	`#include "rmodinit.h"`	46	`#include "rmodinit.h"`
47	`#include "sayonara.h"`	47	`#include "sayonara.h"`
48		48
49	`#include "cmd.h"`	49	`#include "cmd.h"`
50		50
51		51
52	`struct cmd_funcparam {`	52	`struct cmd_funcparam {`
53	`int argc; /* number of arguments */`	53	`int argc; /* number of arguments */`
54	`const char argv[128]; / pointers to each argument */`	54	`const char argv[128]; / pointers to each argument */`
55	`char argvbuf[256]; /* buffer that hold data pointed out by argv[] */`	55	`char argvbuf[256]; /* buffer that hold data pointed out by argv[] */`
56	`unsigned short env_seg; /* segment of environment block */`	56	`unsigned short env_seg; /* segment of environment block */`
57	`struct rmod_props far rmod; / rmod settings */`	57	`struct rmod_props far rmod; / rmod settings */`
58	`unsigned short argoffset; /* offset of cmdline where first argument starts */`	58	`unsigned short argoffset; /* offset of cmdline where first argument starts */`
59	`const char cmdline; / original cmdline (terminated by a NULL) */`	59	`const char cmdline; / original cmdline (terminated by a NULL) */`
60	`unsigned short BUFFERSZ; /* avail space in BUFFER */`	60	`unsigned short BUFFERSZ; /* avail space in BUFFER */`
61	`char BUFFER[1]; /* a buffer for whatever is needed (must be last) */`	61	`char BUFFER[1]; /* a buffer for whatever is needed (must be last) */`
62	`};`	62	`};`
63		63
64	`/* scans argv for the presence of a "/?" parameter. returns 1 if found, 0 otherwise */`	64	`/* scans argv for the presence of a "/?" parameter. returns 1 if found, 0 otherwise */`
65	`static int cmd_ishlp(const struct cmd_funcparam *p) {`	65	`static int cmd_ishlp(const struct cmd_funcparam *p) {`
66	`int i;`	66	`int i;`
67	`for (i = 0; i < p->argc; i++) {`	67	`for (i = 0; i < p->argc; i++) {`
68	`if ((p->argv[i][0] == '/') && (p->argv[i][1] == '?')) return(1);`	68	`if ((p->argv[i][0] == '/') && (p->argv[i][1] == '?')) return(1);`
69	`}`	69	`}`
70	`return(0);`	70	`return(0);`
71	`}`	71	`}`
72		72
73	`#include "cmd/_notimpl.c"`	-
74	`#include "cmd/break.c"`	73	`#include "cmd/break.c"`
75	`#include "cmd/call.c"`	74	`#include "cmd/call.c"`
76	`#include "cmd/cd.c"`	75	`#include "cmd/cd.c"`
77	`#include "cmd/chcp.c"`	76	`#include "cmd/chcp.c"`
78	`#include "cmd/cls.c"`	77	`#include "cmd/cls.c"`
79	`#include "cmd/copy.c"`	78	`#include "cmd/copy.c"`
-		79	`#include "cmd/ctty.c"`
80	`#include "cmd/date.c"`	80	`#include "cmd/date.c"`
81	`#include "cmd/del.c"`	81	`#include "cmd/del.c"`
82	`#include "cmd/for.c"`	82	`#include "cmd/for.c"`
83	`#include "cmd/goto.c"`	83	`#include "cmd/goto.c"`
84	`#include "cmd/if.c"`	84	`#include "cmd/if.c"`
85	`#include "cmd/vol.c" /* must be included before dir.c due to dependency */`	85	`#include "cmd/vol.c" /* must be included before dir.c due to dependency */`
86	`#include "cmd/dir.c"`	86	`#include "cmd/dir.c"`
87	`#include "cmd/echo.c"`	87	`#include "cmd/echo.c"`
88	`#include "cmd/exit.c"`	88	`#include "cmd/exit.c"`
-		89	`#include "cmd/loadhigh.c"`
89	`#include "cmd/ln.c"`	90	`#include "cmd/ln.c"`
90	`#include "cmd/mkdir.c"`	91	`#include "cmd/mkdir.c"`
91	`#include "cmd/path.c"`	92	`#include "cmd/path.c"`
92	`#include "cmd/pause.c"`	93	`#include "cmd/pause.c"`
93	`#include "cmd/prompt.c"`	94	`#include "cmd/prompt.c"`
94	`#include "cmd/rem.c"`	95	`#include "cmd/rem.c"`
95	`#include "cmd/rename.c"`	96	`#include "cmd/rename.c"`
96	`#include "cmd/rmdir.c"`	97	`#include "cmd/rmdir.c"`
97	`#include "cmd/set.c"`	98	`#include "cmd/set.c"`
98	`#include "cmd/shift.c"`	99	`#include "cmd/shift.c"`
99	`#include "cmd/time.c"`	100	`#include "cmd/time.c"`
100	`#include "cmd/truename.c"`	101	`#include "cmd/truename.c"`
101	`#include "cmd/type.c"`	102	`#include "cmd/type.c"`
102	`#include "cmd/ver.c"`	103	`#include "cmd/ver.c"`
103	`#include "cmd/verify.c"`	104	`#include "cmd/verify.c"`
104		105
105		106
106	`struct CMD_ID {`	107	`struct CMD_ID {`
107	`const char *cmd;`	108	`const char *cmd;`
108	`enum cmd_result (func_ptr)(struct cmd_funcparam ); /* pointer to handling function */`	109	`enum cmd_result (func_ptr)(struct cmd_funcparam ); /* pointer to handling function */`
109	`};`	110	`};`
110		111
111	`const struct CMD_ID INTERNAL_CMDS[] = {`	112	`const struct CMD_ID INTERNAL_CMDS[] = {`
112	`{"BREAK", cmd_break},`	113	`{"BREAK", cmd_break},`
113	`{"CALL", cmd_call},`	114	`{"CALL", cmd_call},`
114	`{"CD", cmd_cd},`	115	`{"CD", cmd_cd},`
115	`{"CHCP", cmd_chcp},`	116	`{"CHCP", cmd_chcp},`
116	`{"CHDIR", cmd_cd},`	117	`{"CHDIR", cmd_cd},`
117	`{"CLS", cmd_cls},`	118	`{"CLS", cmd_cls},`
118	`{"COPY", cmd_copy},`	119	`{"COPY", cmd_copy},`
119	`{"CTTY", cmd_notimpl},`	120	`{"CTTY", cmd_ctty},`
120	`{"DATE", cmd_date},`	121	`{"DATE", cmd_date},`
121	`{"DEL", cmd_del},`	122	`{"DEL", cmd_del},`
122	`{"DIR", cmd_dir},`	123	`{"DIR", cmd_dir},`
123	`{"ECHO", cmd_echo},`	124	`{"ECHO", cmd_echo},`
124	`{"ERASE", cmd_del},`	125	`{"ERASE", cmd_del},`
125	`{"EXIT", cmd_exit},`	126	`{"EXIT", cmd_exit},`
126	`{"FOR", cmd_for},`	127	`{"FOR", cmd_for},`
127	`{"GOTO", cmd_goto},`	128	`{"GOTO", cmd_goto},`
128	`{"IF", cmd_if},`	129	`{"IF", cmd_if},`
129	`{"LH", cmd_notimpl},`	130	`{"LH", cmd_loadhigh},`
130	`{"LN", cmd_ln},`	131	`{"LN", cmd_ln},`
131	`{"LOADHIGH",cmd_notimpl},`	132	`{"LOADHIGH",cmd_loadhigh},`
132	`{"MD", cmd_mkdir},`	133	`{"MD", cmd_mkdir},`
133	`{"MKDIR", cmd_mkdir},`	134	`{"MKDIR", cmd_mkdir},`
134	`{"PAUSE", cmd_pause},`	135	`{"PAUSE", cmd_pause},`
135	`{"PATH", cmd_path},`	136	`{"PATH", cmd_path},`
136	`{"PROMPT", cmd_prompt},`	137	`{"PROMPT", cmd_prompt},`
137	`{"RD", cmd_rmdir},`	138	`{"RD", cmd_rmdir},`
138	`{"REM", cmd_rem},`	139	`{"REM", cmd_rem},`
139	`{"REN", cmd_rename},`	140	`{"REN", cmd_rename},`
140	`{"RENAME", cmd_rename},`	141	`{"RENAME", cmd_rename},`
141	`{"RMDIR", cmd_rmdir},`	142	`{"RMDIR", cmd_rmdir},`
142	`{"SET", cmd_set},`	143	`{"SET", cmd_set},`
143	`{"SHIFT", cmd_shift},`	144	`{"SHIFT", cmd_shift},`
144	`{"TIME", cmd_time},`	145	`{"TIME", cmd_time},`
145	`{"TRUENAME",cmd_truename},`	146	`{"TRUENAME",cmd_truename},`
146	`{"TYPE", cmd_type},`	147	`{"TYPE", cmd_type},`
147	`{"VER", cmd_ver},`	148	`{"VER", cmd_ver},`
148	`{"VERIFY", cmd_verify},`	149	`{"VERIFY", cmd_verify},`
149	`{"VOL", cmd_vol},`	150	`{"VOL", cmd_vol},`
150	`{NULL, NULL}`	151	`{NULL, NULL}`
151	`};`	152	`};`
152		153
153		154
154	`/* NULL if cmdline is not matching an internal command, otherwise returns a`	155	`/* NULL if cmdline is not matching an internal command, otherwise returns a`
155	`* pointer to a CMD_ID struct */`	156	`* pointer to a CMD_ID struct */`
156	`static const struct CMD_ID cmd_match(const char cmdline, unsigned short *argoffset) {`	157	`static const struct CMD_ID cmd_match(const char cmdline, unsigned short *argoffset) {`
157	`unsigned short i;`	158	`unsigned short i;`
158	`char buff[10];`	159	`char buff[10];`
159		160
160	`/* copy command to buffer, until space, NULL, tab, return, dot, slash or backslash */`	161	`/* copy command to buffer, until space, NULL, tab, return, dot, slash or backslash */`
161	`for (i = 0; i < 9; i++) {`	162	`for (i = 0; i < 9; i++) {`
162	`if (cmdline[i] == ' ') break;`	163	`if (cmdline[i] == ' ') break;`
163	`if (cmdline[i] == 0) break;`	164	`if (cmdline[i] == 0) break;`
164	`if (cmdline[i] == '\t') break;`	165	`if (cmdline[i] == '\t') break;`
165	`if (cmdline[i] == '\r') break;`	166	`if (cmdline[i] == '\r') break;`
166	`if (cmdline[i] == '.') break;`	167	`if (cmdline[i] == '.') break;`
167	`if (cmdline[i] == '/') break;`	168	`if (cmdline[i] == '/') break;`
168	`if (cmdline[i] == '\\') break;`	169	`if (cmdline[i] == '\\') break;`
169	`buff[i] = cmdline[i];`	170	`buff[i] = cmdline[i];`
170	`}`	171	`}`
171	`buff[i] = 0;`	172	`buff[i] = 0;`
172		173
173	`/* advance to nearest non-space to find where arguments start */`	174	`/* advance to nearest non-space to find where arguments start */`
174	`while (cmdline[i] == ' ') i++;`	175	`while (cmdline[i] == ' ') i++;`
175	`*argoffset = i;`	176	`*argoffset = i;`
176		177
177	`/* try matching an internal command */`	178	`/* try matching an internal command */`
178	`for (i = 0; INTERNAL_CMDS[i].cmd != NULL; i++) {`	179	`for (i = 0; INTERNAL_CMDS[i].cmd != NULL; i++) {`
179	`/printf("imatch(%s,%s)\r\n", buff, INTERNAL_CMDS[i].cmd); /`	180	`/printf("imatch(%s,%s)\r\n", buff, INTERNAL_CMDS[i].cmd); /`
180	`if (imatch(buff, INTERNAL_CMDS[i].cmd)) {`	181	`if (imatch(buff, INTERNAL_CMDS[i].cmd)) {`
181	`/printf("match cmd i=%u (buff=%s)\r\n", i, buff);/`	182	`/printf("match cmd i=%u (buff=%s)\r\n", i, buff);/`
182	`return(&(INTERNAL_CMDS[i]));`	183	`return(&(INTERNAL_CMDS[i]));`
183	`}`	184	`}`
184	`}`	185	`}`
185		186
186	`return(NULL); /* command is not recognized as internal */`	187	`return(NULL); /* command is not recognized as internal */`
187	`}`	188	`}`
188		189
189		190
190	`/* explodes a command into an array of arguments where last arg is NULL.`	191	`/* explodes a command into an array of arguments where last arg is NULL.`
191	`* if argvlist is not NULL, it will be filled with pointers that point to buff`	192	`* if argvlist is not NULL, it will be filled with pointers that point to buff`
192	`* locations. buff is filled with all the arguments, each argument being`	193	`* locations. buff is filled with all the arguments, each argument being`
193	`* zero-separated. buff is terminated with an empty argument to mark the end`	194	`* zero-separated. buff is terminated with an empty argument to mark the end`
194	`* of arguments.`	195	`* of arguments.`
195	`* returns number of args */`	196	`* returns number of args */`
196	`unsigned short cmd_explode(char buff, const char far s, char const **argvlist) {`	197	`unsigned short cmd_explode(char buff, const char far s, char const **argvlist) {`
197	`int si = 0, argc = 0, i = 0;`	198	`int si = 0, argc = 0, i = 0;`
198	`for (;;) {`	199	`for (;;) {`
199	`/* skip to next non-space character */`	200	`/* skip to next non-space character */`
200	`while (s[si] == ' ') si++;`	201	`while (s[si] == ' ') si++;`
201	`/* end of string? */`	202	`/* end of string? */`
202	`if (s[si] == 0) break;`	203	`if (s[si] == 0) break;`
203	`/* set argv ptr */`	204	`/* set argv ptr */`
204	`if (argvlist) argvlist[argc] = buff + i;`	205	`if (argvlist) argvlist[argc] = buff + i;`
205	`argc++;`	206	`argc++;`
206	`/* find next arg delimiter (spc, null, slash or plus) while copying arg to local buffer */`	207	`/* find next arg delimiter (spc, null, slash or plus) while copying arg to local buffer */`
207	`do {`	208	`do {`
208	`buff[i++] = s[si++];`	209	`buff[i++] = s[si++];`
209	`} while (s[si] != ' ' && s[si] != 0 && s[si] != '/' && s[si] != '+');`	210	`} while (s[si] != ' ' && s[si] != 0 && s[si] != '/' && s[si] != '+');`
210	`buff[i++] = 0;`	211	`buff[i++] = 0;`
211	`/* is this end of string? */`	212	`/* is this end of string? */`
212	`if (s[si] == 0) break;`	213	`if (s[si] == 0) break;`
213	`}`	214	`}`
214	`buff[i] = 0; /* terminate with one extra zero to tell "this is the end of list" */`	215	`buff[i] = 0; /* terminate with one extra zero to tell "this is the end of list" */`
215	`if (argvlist) argvlist[argc] = NULL;`	216	`if (argvlist) argvlist[argc] = NULL;`
216	`return(argc);`	217	`return(argc);`
217	`}`	218	`}`
218		219
219		220
220	`enum cmd_result cmd_process(struct rmod_props far rmod, unsigned short env_seg, const char cmdline, void BUFFER, unsigned short BUFFERSZ, const struct redir_data redir, unsigned char delstdin) {`	221	`enum cmd_result cmd_process(struct rmod_props far rmod, unsigned short env_seg, const char cmdline, void BUFFER, unsigned short BUFFERSZ, const struct redir_data redir, unsigned char delstdin) {`
221	`const struct CMD_ID *cmdptr;`	222	`const struct CMD_ID *cmdptr;`
222	`unsigned short argoffset;`	223	`unsigned short argoffset;`
223	`enum cmd_result cmdres;`	224	`enum cmd_result cmdres;`
224	`struct cmd_funcparam p = (void )BUFFER;`	225	`struct cmd_funcparam p = (void )BUFFER;`
225	`p->BUFFERSZ = BUFFERSZ - sizeof(*p);`	226	`p->BUFFERSZ = BUFFERSZ - sizeof(*p);`
226		227
227	`/* special case: is this a drive change? (like "E:") */`	228	`/* special case: is this a drive change? (like "E:") */`
228	`if ((cmdline[0] != 0) && (cmdline[1] == ':') && ((cmdline[2] == ' ') \|\| (cmdline[2] == 0))) {`	229	`if ((cmdline[0] != 0) && (cmdline[1] == ':') && ((cmdline[2] == ' ') \|\| (cmdline[2] == 0))) {`
229	`if (((cmdline[0] >= 'a') && (cmdline[0] <= 'z')) \|\| ((cmdline[0] >= 'A') && (cmdline[0] <= 'Z'))) {`	230	`if (((cmdline[0] >= 'a') && (cmdline[0] <= 'z')) \|\| ((cmdline[0] >= 'A') && (cmdline[0] <= 'Z'))) {`
230	`unsigned char drive = cmdline[0];`	231	`unsigned char drive = cmdline[0];`
231	`unsigned char curdrive = 0;`	232	`unsigned char curdrive = 0;`
232	`if (drive >= 'a') {`	233	`if (drive >= 'a') {`
233	`drive -= 'a';`	234	`drive -= 'a';`
234	`} else {`	235	`} else {`
235	`drive -= 'A';`	236	`drive -= 'A';`
236	`}`	237	`}`
237	`_asm {`	238	`_asm {`
238	`push ax`	239	`push ax`
239	`push dx`	240	`push dx`
240	`mov ah, 0x0e /* DOS 1+ - SELECT DEFAULT DRIVE */`	241	`mov ah, 0x0e /* DOS 1+ - SELECT DEFAULT DRIVE */`
241	`mov dl, drive /* DL = new default drive (00h = A:, 01h = B:, etc) */`	242	`mov dl, drive /* DL = new default drive (00h = A:, 01h = B:, etc) */`
242	`int 0x21`	243	`int 0x21`
243	`mov ah, 0x19 /* DOS 1+ - GET CURRENT DRIVE */`	244	`mov ah, 0x19 /* DOS 1+ - GET CURRENT DRIVE */`
244	`int 0x21`	245	`int 0x21`
245	`mov curdrive, al /* cur drive (0=A, 1=B, etc) */`	246	`mov curdrive, al /* cur drive (0=A, 1=B, etc) */`
246	`pop dx`	247	`pop dx`
247	`pop ax`	248	`pop ax`
248	`}`	249	`}`
249	`if (curdrive == drive) return(CMD_OK);`	250	`if (curdrive == drive) return(CMD_OK);`
250	`nls_outputnl_doserr(0x0f);`	251	`nls_outputnl_doserr(0x0f);`
251	`return(CMD_FAIL);`	252	`return(CMD_FAIL);`
252	`}`	253	`}`
253	`}`	254	`}`
254		255
255	`/* try matching an internal command */`	256	`/* try matching an internal command */`
256	`cmdptr = cmd_match(cmdline, &argoffset);`	257	`cmdptr = cmd_match(cmdline, &argoffset);`
257	`if (cmdptr == NULL) return(CMD_NOTFOUND); /* command is not recognized as internal */`	258	`if (cmdptr == NULL) return(CMD_NOTFOUND); /* command is not recognized as internal */`
258		259
259	`/* printf("recognized internal command: '%s', tail of command at offset %u\r\n", cmdptr->cmd, argoffset); */`	260	`/* printf("recognized internal command: '%s', tail of command at offset %u\r\n", cmdptr->cmd, argoffset); */`
260		261
261	`/* apply redirections (if any) */`	262	`/* apply redirections (if any) */`
262	`if (redir_apply(redir) != 0) return(CMD_FAIL);`	263	`if (redir_apply(redir) != 0) return(CMD_FAIL);`
263		264
264	`/* prepare function parameters and feed it to the cmd handling function */`	265	`/* prepare function parameters and feed it to the cmd handling function */`
265	`p->argc = cmd_explode(p->argvbuf, cmdline + argoffset, p->argv);`	266	`p->argc = cmd_explode(p->argvbuf, cmdline + argoffset, p->argv);`
266	`p->env_seg = env_seg;`	267	`p->env_seg = env_seg;`
267	`p->rmod = rmod;`	268	`p->rmod = rmod;`
268	`p->argoffset = argoffset;`	269	`p->argoffset = argoffset;`
269	`p->cmdline = cmdline;`	270	`p->cmdline = cmdline;`
270		271
271	`cmdres = (cmdptr->func_ptr)(p);`	272	`cmdres = (cmdptr->func_ptr)(p);`
272		273
273	`/* cancel redirections */`	274	`/* cancel redirections */`
274	`redir_revert();`	275	`redir_revert();`
275		276
276	`/* delete stdin temporary file */`	277	`/* delete stdin temporary file */`
277	`if (delstdin) {`	278	`if (delstdin) {`
278	`const char *fname = redir->stdinfile;`	279	`const char *fname = redir->stdinfile;`
279	`unsigned short doserr = 0;`	280	`unsigned short doserr = 0;`
280	`_asm {`	281	`_asm {`
281	`push ax`	282	`push ax`
282	`push dx`	283	`push dx`
283	`mov ah, 0x41 /* delete a file */`	284	`mov ah, 0x41 /* delete a file */`
284	`mov dx, fname /* DS:DX - filename to delete */`	285	`mov dx, fname /* DS:DX - filename to delete */`
285	`int 0x21`	286	`int 0x21`
286	`jnc DONE`	287	`jnc DONE`
287	`mov doserr, ax`	288	`mov doserr, ax`
288	`DONE:`	289	`DONE:`
289	`pop dx`	290	`pop dx`
290	`pop ax`	291	`pop ax`
291	`}`	292	`}`
292	`if (doserr) {`	293	`if (doserr) {`
293	`output(fname);`	294	`output(fname);`
294	`output(": ");`	295	`output(": ");`
295	`nls_outputnl_doserr(doserr);`	296	`nls_outputnl_doserr(doserr);`
296	`}`	297	`}`
297	`}`	298	`}`
298		299
299	`return(cmdres);`	300	`return(cmdres);`
300	`}`	301	`}`
301		302

Subversion Repositories SvarDOS

(root)/svarcom/trunk/cmd.c – Rev 1045 → 1090