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 used to pass all necessary information to the sub-commands */
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
 * this is used by most sub-commands to detect /? invocations */
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 1090	Rev 1129
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 used to pass all necessary information to the sub-commands */`
52	`struct cmd_funcparam {`	53	`struct cmd_funcparam {`
53	`int argc; /* number of arguments */`	54	`int argc; /* number of arguments */`
54	`const char argv[128]; / pointers to each argument */`	55	`const char argv[128]; / pointers to each argument */`
55	`char argvbuf[256]; /* buffer that hold data pointed out by argv[] */`	56	`char argvbuf[256]; /* buffer that hold data pointed out by argv[] */`
56	`unsigned short env_seg; /* segment of environment block */`	57	`unsigned short env_seg; /* segment of environment block */`
57	`struct rmod_props far rmod; / rmod settings */`	58	`struct rmod_props far rmod; / rmod settings */`
58	`unsigned short argoffset; /* offset of cmdline where first argument starts */`	59	`unsigned short argoffset; /* offset of cmdline where first argument starts */`
59	`const char cmdline; / original cmdline (terminated by a NULL) */`	60	`const char cmdline; / original cmdline (terminated by a NULL) */`
60	`unsigned short BUFFERSZ; /* avail space in BUFFER */`	61	`unsigned short BUFFERSZ; /* avail space in BUFFER */`
61	`char BUFFER[1]; /* a buffer for whatever is needed (must be last) */`	62	`char BUFFER[1]; /* a buffer for whatever is needed (must be last) */`
62	`};`	63	`};`
63		64
-		65
64	`/* scans argv for the presence of a "/?" parameter. returns 1 if found, 0 otherwise */`	66	`/* scans argv for the presence of a "/?" parameter.`
-		67	`* returns 1 if found, 0 otherwise`
-		68	`* this is used by most sub-commands to detect /? invocations */`
65	`static int cmd_ishlp(const struct cmd_funcparam *p) {`	69	`static int cmd_ishlp(const struct cmd_funcparam *p) {`
66	`int i;`	70	`int i;`
67	`for (i = 0; i < p->argc; i++) {`	71	`for (i = 0; i < p->argc; i++) {`
68	`if ((p->argv[i][0] == '/') && (p->argv[i][1] == '?')) return(1);`	72	`if ((p->argv[i][0] == '/') && (p->argv[i][1] == '?')) return(1);`
69	`}`	73	`}`
70	`return(0);`	74	`return(0);`
71	`}`	75	`}`
72		76
73	`#include "cmd/break.c"`	77	`#include "cmd/break.c"`
74	`#include "cmd/call.c"`	78	`#include "cmd/call.c"`
75	`#include "cmd/cd.c"`	79	`#include "cmd/cd.c"`
76	`#include "cmd/chcp.c"`	80	`#include "cmd/chcp.c"`
77	`#include "cmd/cls.c"`	81	`#include "cmd/cls.c"`
78	`#include "cmd/copy.c"`	82	`#include "cmd/copy.c"`
79	`#include "cmd/ctty.c"`	83	`#include "cmd/ctty.c"`
80	`#include "cmd/date.c"`	84	`#include "cmd/date.c"`
81	`#include "cmd/del.c"`	85	`#include "cmd/del.c"`
82	`#include "cmd/for.c"`	86	`#include "cmd/for.c"`
83	`#include "cmd/goto.c"`	87	`#include "cmd/goto.c"`
84	`#include "cmd/if.c"`	88	`#include "cmd/if.c"`
85	`#include "cmd/vol.c" /* must be included before dir.c due to dependency */`	89	`#include "cmd/vol.c" /* must be included before dir.c due to dependency */`
86	`#include "cmd/dir.c"`	90	`#include "cmd/dir.c"`
87	`#include "cmd/echo.c"`	91	`#include "cmd/echo.c"`
88	`#include "cmd/exit.c"`	92	`#include "cmd/exit.c"`
89	`#include "cmd/loadhigh.c"`	93	`#include "cmd/loadhigh.c"`
90	`#include "cmd/ln.c"`	94	`#include "cmd/ln.c"`
91	`#include "cmd/mkdir.c"`	95	`#include "cmd/mkdir.c"`
92	`#include "cmd/path.c"`	96	`#include "cmd/path.c"`
93	`#include "cmd/pause.c"`	97	`#include "cmd/pause.c"`
94	`#include "cmd/prompt.c"`	98	`#include "cmd/prompt.c"`
95	`#include "cmd/rem.c"`	99	`#include "cmd/rem.c"`
96	`#include "cmd/rename.c"`	100	`#include "cmd/rename.c"`
97	`#include "cmd/rmdir.c"`	101	`#include "cmd/rmdir.c"`
98	`#include "cmd/set.c"`	102	`#include "cmd/set.c"`
99	`#include "cmd/shift.c"`	103	`#include "cmd/shift.c"`
100	`#include "cmd/time.c"`	104	`#include "cmd/time.c"`
101	`#include "cmd/truename.c"`	105	`#include "cmd/truename.c"`
102	`#include "cmd/type.c"`	106	`#include "cmd/type.c"`
103	`#include "cmd/ver.c"`	107	`#include "cmd/ver.c"`
104	`#include "cmd/verify.c"`	108	`#include "cmd/verify.c"`
105		109
106		110
107	`struct CMD_ID {`	111	`struct CMD_ID {`
108	`const char *cmd;`	112	`const char *cmd;`
109	`enum cmd_result (func_ptr)(struct cmd_funcparam ); /* pointer to handling function */`	113	`enum cmd_result (func_ptr)(struct cmd_funcparam ); /* pointer to handling function */`
110	`};`	114	`};`
111		115
112	`const struct CMD_ID INTERNAL_CMDS[] = {`	116	`const struct CMD_ID INTERNAL_CMDS[] = {`
113	`{"BREAK", cmd_break},`	117	`{"BREAK", cmd_break},`
114	`{"CALL", cmd_call},`	118	`{"CALL", cmd_call},`
115	`{"CD", cmd_cd},`	119	`{"CD", cmd_cd},`
116	`{"CHCP", cmd_chcp},`	120	`{"CHCP", cmd_chcp},`
117	`{"CHDIR", cmd_cd},`	121	`{"CHDIR", cmd_cd},`
118	`{"CLS", cmd_cls},`	122	`{"CLS", cmd_cls},`
119	`{"COPY", cmd_copy},`	123	`{"COPY", cmd_copy},`
120	`{"CTTY", cmd_ctty},`	124	`{"CTTY", cmd_ctty},`
121	`{"DATE", cmd_date},`	125	`{"DATE", cmd_date},`
122	`{"DEL", cmd_del},`	126	`{"DEL", cmd_del},`
123	`{"DIR", cmd_dir},`	127	`{"DIR", cmd_dir},`
124	`{"ECHO", cmd_echo},`	128	`{"ECHO", cmd_echo},`
125	`{"ERASE", cmd_del},`	129	`{"ERASE", cmd_del},`
126	`{"EXIT", cmd_exit},`	130	`{"EXIT", cmd_exit},`
127	`{"FOR", cmd_for},`	131	`{"FOR", cmd_for},`
128	`{"GOTO", cmd_goto},`	132	`{"GOTO", cmd_goto},`
129	`{"IF", cmd_if},`	133	`{"IF", cmd_if},`
130	`{"LH", cmd_loadhigh},`	134	`{"LH", cmd_loadhigh},`
131	`{"LN", cmd_ln},`	135	`{"LN", cmd_ln},`
132	`{"LOADHIGH",cmd_loadhigh},`	136	`{"LOADHIGH",cmd_loadhigh},`
133	`{"MD", cmd_mkdir},`	137	`{"MD", cmd_mkdir},`
134	`{"MKDIR", cmd_mkdir},`	138	`{"MKDIR", cmd_mkdir},`
135	`{"PAUSE", cmd_pause},`	139	`{"PAUSE", cmd_pause},`
136	`{"PATH", cmd_path},`	140	`{"PATH", cmd_path},`
137	`{"PROMPT", cmd_prompt},`	141	`{"PROMPT", cmd_prompt},`
138	`{"RD", cmd_rmdir},`	142	`{"RD", cmd_rmdir},`
139	`{"REM", cmd_rem},`	143	`{"REM", cmd_rem},`
140	`{"REN", cmd_rename},`	144	`{"REN", cmd_rename},`
141	`{"RENAME", cmd_rename},`	145	`{"RENAME", cmd_rename},`
142	`{"RMDIR", cmd_rmdir},`	146	`{"RMDIR", cmd_rmdir},`
143	`{"SET", cmd_set},`	147	`{"SET", cmd_set},`
144	`{"SHIFT", cmd_shift},`	148	`{"SHIFT", cmd_shift},`
145	`{"TIME", cmd_time},`	149	`{"TIME", cmd_time},`
146	`{"TRUENAME",cmd_truename},`	150	`{"TRUENAME",cmd_truename},`
147	`{"TYPE", cmd_type},`	151	`{"TYPE", cmd_type},`
148	`{"VER", cmd_ver},`	152	`{"VER", cmd_ver},`
149	`{"VERIFY", cmd_verify},`	153	`{"VERIFY", cmd_verify},`
150	`{"VOL", cmd_vol},`	154	`{"VOL", cmd_vol},`
151	`{NULL, NULL}`	155	`{NULL, NULL}`
152	`};`	156	`};`
153		157
154		158
155	`/* NULL if cmdline is not matching an internal command, otherwise returns a`	159	`/* NULL if cmdline is not matching an internal command, otherwise returns a`
156	`* pointer to a CMD_ID struct */`	160	`* pointer to a CMD_ID struct */`
157	`static const struct CMD_ID cmd_match(const char cmdline, unsigned short *argoffset) {`	161	`static const struct CMD_ID cmd_match(const char cmdline, unsigned short *argoffset) {`
158	`unsigned short i;`	162	`unsigned short i;`
159	`char buff[10];`	163	`char buff[10];`
160		164
161	`/* copy command to buffer, until space, NULL, tab, return, dot, slash or backslash */`	165	`/* copy command to buffer, until space, NULL, tab, return, dot, slash or backslash */`
162	`for (i = 0; i < 9; i++) {`	166	`for (i = 0; i < 9; i++) {`
163	`if (cmdline[i] == ' ') break;`	167	`if (cmdline[i] == ' ') break;`
164	`if (cmdline[i] == 0) break;`	168	`if (cmdline[i] == 0) break;`
165	`if (cmdline[i] == '\t') break;`	169	`if (cmdline[i] == '\t') break;`
166	`if (cmdline[i] == '\r') break;`	170	`if (cmdline[i] == '\r') break;`
167	`if (cmdline[i] == '.') break;`	171	`if (cmdline[i] == '.') break;`
168	`if (cmdline[i] == '/') break;`	172	`if (cmdline[i] == '/') break;`
169	`if (cmdline[i] == '\\') break;`	173	`if (cmdline[i] == '\\') break;`
170	`buff[i] = cmdline[i];`	174	`buff[i] = cmdline[i];`
171	`}`	175	`}`
172	`buff[i] = 0;`	176	`buff[i] = 0;`
173		177
174	`/* advance to nearest non-space to find where arguments start */`	178	`/* advance to nearest non-space to find where arguments start */`
175	`while (cmdline[i] == ' ') i++;`	179	`while (cmdline[i] == ' ') i++;`
176	`*argoffset = i;`	180	`*argoffset = i;`
177		181
178	`/* try matching an internal command */`	182	`/* try matching an internal command */`
179	`for (i = 0; INTERNAL_CMDS[i].cmd != NULL; i++) {`	183	`for (i = 0; INTERNAL_CMDS[i].cmd != NULL; i++) {`
180	`/printf("imatch(%s,%s)\r\n", buff, INTERNAL_CMDS[i].cmd); /`	184	`/printf("imatch(%s,%s)\r\n", buff, INTERNAL_CMDS[i].cmd); /`
181	`if (imatch(buff, INTERNAL_CMDS[i].cmd)) {`	185	`if (imatch(buff, INTERNAL_CMDS[i].cmd)) {`
182	`/printf("match cmd i=%u (buff=%s)\r\n", i, buff);/`	186	`/printf("match cmd i=%u (buff=%s)\r\n", i, buff);/`
183	`return(&(INTERNAL_CMDS[i]));`	187	`return(&(INTERNAL_CMDS[i]));`
184	`}`	188	`}`
185	`}`	189	`}`
186		190
187	`return(NULL); /* command is not recognized as internal */`	191	`return(NULL); /* command is not recognized as internal */`
188	`}`	192	`}`
189		193
190		194
191	`/* explodes a command into an array of arguments where last arg is NULL.`	195	`/* explodes a command into an array of arguments where last arg is NULL.`
192	`* if argvlist is not NULL, it will be filled with pointers that point to buff`	196	`* if argvlist is not NULL, it will be filled with pointers that point to buff`
193	`* locations. buff is filled with all the arguments, each argument being`	197	`* locations. buff is filled with all the arguments, each argument being`
194	`* zero-separated. buff is terminated with an empty argument to mark the end`	198	`* zero-separated. buff is terminated with an empty argument to mark the end`
195	`* of arguments.`	199	`* of arguments.`
196	`* returns number of args */`	200	`* returns number of args */`
197	`unsigned short cmd_explode(char buff, const char far s, char const **argvlist) {`	201	`unsigned short cmd_explode(char buff, const char far s, char const **argvlist) {`
198	`int si = 0, argc = 0, i = 0;`	202	`int si = 0, argc = 0, i = 0;`
199	`for (;;) {`	203	`for (;;) {`
200	`/* skip to next non-space character */`	204	`/* skip to next non-space character */`
201	`while (s[si] == ' ') si++;`	205	`while (s[si] == ' ') si++;`
202	`/* end of string? */`	206	`/* end of string? */`
203	`if (s[si] == 0) break;`	207	`if (s[si] == 0) break;`
204	`/* set argv ptr */`	208	`/* set argv ptr */`
205	`if (argvlist) argvlist[argc] = buff + i;`	209	`if (argvlist) argvlist[argc] = buff + i;`
206	`argc++;`	210	`argc++;`
207	`/* find next arg delimiter (spc, null, slash or plus) while copying arg to local buffer */`	211	`/* find next arg delimiter (spc, null, slash or plus) while copying arg to local buffer */`
208	`do {`	212	`do {`
209	`buff[i++] = s[si++];`	213	`buff[i++] = s[si++];`
210	`} while (s[si] != ' ' && s[si] != 0 && s[si] != '/' && s[si] != '+');`	214	`} while (s[si] != ' ' && s[si] != 0 && s[si] != '/' && s[si] != '+');`
211	`buff[i++] = 0;`	215	`buff[i++] = 0;`
212	`/* is this end of string? */`	216	`/* is this end of string? */`
213	`if (s[si] == 0) break;`	217	`if (s[si] == 0) break;`
214	`}`	218	`}`
215	`buff[i] = 0; /* terminate with one extra zero to tell "this is the end of list" */`	219	`buff[i] = 0; /* terminate with one extra zero to tell "this is the end of list" */`
216	`if (argvlist) argvlist[argc] = NULL;`	220	`if (argvlist) argvlist[argc] = NULL;`
217	`return(argc);`	221	`return(argc);`
218	`}`	222	`}`
219		223
220		224
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) {`	225	`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) {`
222	`const struct CMD_ID *cmdptr;`	226	`const struct CMD_ID *cmdptr;`
223	`unsigned short argoffset;`	227	`unsigned short argoffset;`
224	`enum cmd_result cmdres;`	228	`enum cmd_result cmdres;`
225	`struct cmd_funcparam p = (void )BUFFER;`	229	`struct cmd_funcparam p = (void )BUFFER;`
226	`p->BUFFERSZ = BUFFERSZ - sizeof(*p);`	230	`p->BUFFERSZ = BUFFERSZ - sizeof(*p);`
227		231
228	`/* special case: is this a drive change? (like "E:") */`	232	`/* special case: is this a drive change? (like "E:") */`
229	`if ((cmdline[0] != 0) && (cmdline[1] == ':') && ((cmdline[2] == ' ') \|\| (cmdline[2] == 0))) {`	233	`if ((cmdline[0] != 0) && (cmdline[1] == ':') && ((cmdline[2] == ' ') \|\| (cmdline[2] == 0))) {`
230	`if (((cmdline[0] >= 'a') && (cmdline[0] <= 'z')) \|\| ((cmdline[0] >= 'A') && (cmdline[0] <= 'Z'))) {`	234	`if (((cmdline[0] >= 'a') && (cmdline[0] <= 'z')) \|\| ((cmdline[0] >= 'A') && (cmdline[0] <= 'Z'))) {`
231	`unsigned char drive = cmdline[0];`	235	`unsigned char drive = cmdline[0];`
232	`unsigned char curdrive = 0;`	236	`unsigned char curdrive = 0;`
233	`if (drive >= 'a') {`	237	`if (drive >= 'a') {`
234	`drive -= 'a';`	238	`drive -= 'a';`
235	`} else {`	239	`} else {`
236	`drive -= 'A';`	240	`drive -= 'A';`
237	`}`	241	`}`
238	`_asm {`	242	`_asm {`
239	`push ax`	243	`push ax`
240	`push dx`	244	`push dx`
241	`mov ah, 0x0e /* DOS 1+ - SELECT DEFAULT DRIVE */`	245	`mov ah, 0x0e /* DOS 1+ - SELECT DEFAULT DRIVE */`
242	`mov dl, drive /* DL = new default drive (00h = A:, 01h = B:, etc) */`	246	`mov dl, drive /* DL = new default drive (00h = A:, 01h = B:, etc) */`
243	`int 0x21`	247	`int 0x21`
244	`mov ah, 0x19 /* DOS 1+ - GET CURRENT DRIVE */`	248	`mov ah, 0x19 /* DOS 1+ - GET CURRENT DRIVE */`
245	`int 0x21`	249	`int 0x21`
246	`mov curdrive, al /* cur drive (0=A, 1=B, etc) */`	250	`mov curdrive, al /* cur drive (0=A, 1=B, etc) */`
247	`pop dx`	251	`pop dx`
248	`pop ax`	252	`pop ax`
249	`}`	253	`}`
250	`if (curdrive == drive) return(CMD_OK);`	254	`if (curdrive == drive) return(CMD_OK);`
251	`nls_outputnl_doserr(0x0f);`	255	`nls_outputnl_doserr(0x0f);`
252	`return(CMD_FAIL);`	256	`return(CMD_FAIL);`
253	`}`	257	`}`
254	`}`	258	`}`
255		259
256	`/* try matching an internal command */`	260	`/* try matching an internal command */`
257	`cmdptr = cmd_match(cmdline, &argoffset);`	261	`cmdptr = cmd_match(cmdline, &argoffset);`
258	`if (cmdptr == NULL) return(CMD_NOTFOUND); /* command is not recognized as internal */`	262	`if (cmdptr == NULL) return(CMD_NOTFOUND); /* command is not recognized as internal */`
259		263
260	`/* printf("recognized internal command: '%s', tail of command at offset %u\r\n", cmdptr->cmd, argoffset); */`	264	`/* printf("recognized internal command: '%s', tail of command at offset %u\r\n", cmdptr->cmd, argoffset); */`
261		265
262	`/* apply redirections (if any) */`	266	`/* apply redirections (if any) */`
263	`if (redir_apply(redir) != 0) return(CMD_FAIL);`	267	`if (redir_apply(redir) != 0) return(CMD_FAIL);`
264		268
265	`/* prepare function parameters and feed it to the cmd handling function */`	269	`/* prepare function parameters and feed it to the cmd handling function */`
266	`p->argc = cmd_explode(p->argvbuf, cmdline + argoffset, p->argv);`	270	`p->argc = cmd_explode(p->argvbuf, cmdline + argoffset, p->argv);`
267	`p->env_seg = env_seg;`	271	`p->env_seg = env_seg;`
268	`p->rmod = rmod;`	272	`p->rmod = rmod;`
269	`p->argoffset = argoffset;`	273	`p->argoffset = argoffset;`
270	`p->cmdline = cmdline;`	274	`p->cmdline = cmdline;`
271		275
272	`cmdres = (cmdptr->func_ptr)(p);`	276	`cmdres = (cmdptr->func_ptr)(p);`
273		277
274	`/* cancel redirections */`	278	`/* cancel redirections */`
275	`redir_revert();`	279	`redir_revert();`
276		280
277	`/* delete stdin temporary file */`	281	`/* delete stdin temporary file */`
278	`if (delstdin) {`	282	`if (delstdin) {`
279	`const char *fname = redir->stdinfile;`	283	`const char *fname = redir->stdinfile;`
280	`unsigned short doserr = 0;`	284	`unsigned short doserr = 0;`
281	`_asm {`	285	`_asm {`
282	`push ax`	286	`push ax`
283	`push dx`	287	`push dx`
284	`mov ah, 0x41 /* delete a file */`	288	`mov ah, 0x41 /* delete a file */`
285	`mov dx, fname /* DS:DX - filename to delete */`	289	`mov dx, fname /* DS:DX - filename to delete */`
286	`int 0x21`	290	`int 0x21`
287	`jnc DONE`	291	`jnc DONE`
288	`mov doserr, ax`	292	`mov doserr, ax`
289	`DONE:`	293	`DONE:`
290	`pop dx`	294	`pop dx`
291	`pop ax`	295	`pop ax`
292	`}`	296	`}`
293	`if (doserr) {`	297	`if (doserr) {`
294	`output(fname);`	298	`output(fname);`
295	`output(": ");`	299	`output(": ");`
296	`nls_outputnl_doserr(doserr);`	300	`nls_outputnl_doserr(doserr);`
297	`}`	301	`}`
298	`}`	302	`}`
299		303
300	`return(cmdres);`	304	`return(cmdres);`
301	`}`	305	`}`
302		306

Subversion Repositories SvarDOS

(root)/svarcom/trunk/cmd.c – Rev 1090 → 1129