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 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
 * matches internal commands and executes them
 * returns -1 or exit code if processed
 * returns -2 if command unrecognized
 */
 
#include <i86.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
 
#include "doserr.h"
#include "env.h"
#include "helpers.h"
#include "rmodinit.h"
#include "sayonara.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/_notimpl.c"
#include "cmd/break.c"
#include "cmd/cd.c"
#include "cmd/chcp.c"
#include "cmd/cls.c"
#include "cmd/copy.c"
#include "cmd/date.c"
#include "cmd/del.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/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/type.c"
#include "cmd/ver.c"
#include "cmd/verify.c"
 
#include "cmd.h"
 
 
struct CMD_ID {
  const char *cmd;
  int (*func_ptr)(struct cmd_funcparam *); /* pointer to handling function */
};
 
const struct CMD_ID INTERNAL_CMDS[] = {
  {"BREAK",   cmd_break},
  {"CD",      cmd_cd},
  {"CHCP",    cmd_chcp},
  {"CHDIR",   cmd_cd},
  {"CLS",     cmd_cls},
  {"COPY",    cmd_copy},
  {"CTTY",    cmd_notimpl},
  {"DATE",    cmd_date},
  {"DEL",     cmd_del},
  {"DIR",     cmd_dir},
  {"ECHO",    cmd_echo},
  {"ERASE",   cmd_del},
  {"EXIT",    cmd_exit},
  {"LH",      cmd_notimpl},
  {"LOADHIGH",cmd_notimpl},
  {"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},
  {"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);
}
 
 
int cmd_process(struct rmod_props far *rmod, unsigned short env_seg, const char *cmdline, void *BUFFER, unsigned short BUFFERSZ) {
  const struct CMD_ID *cmdptr;
  unsigned short argoffset;
  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) puts(doserr(0x0f));
      return(-1);
    }
  }
 
  /* try matching an internal command */
  cmdptr = cmd_match(cmdline, &argoffset);
  if (cmdptr == NULL) return(-2); /* command is not recognized as internal */
 
  /* printf("recognized internal command: '%s', tail of command at offset %u\r\n", cmdptr->cmd, argoffset); */
 
  /* 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;
 
  return((cmdptr->func_ptr)(p));
}
 

Rev 508	Rev 514
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	`/* entry point for internal commands`	25	`/* entry point for internal commands`
26	`* matches internal commands and executes them`	26	`* matches internal commands and executes them`
27	`* returns -1 or exit code if processed`	27	`* returns -1 or exit code if processed`
28	`* returns -2 if command unrecognized`	28	`* returns -2 if command unrecognized`
29	`*/`	29	`*/`
30		30
31	`#include <i86.h>`	31	`#include <i86.h>`
32	`#include <stdio.h>`	32	`#include <stdio.h>`
33	`#include <stdlib.h>`	33	`#include <stdlib.h>`
34	`#include <string.h>`	34	`#include <string.h>`
35		35
36	`#include "doserr.h"`	36	`#include "doserr.h"`
37	`#include "env.h"`	37	`#include "env.h"`
38	`#include "helpers.h"`	38	`#include "helpers.h"`
39	`#include "rmodinit.h"`	39	`#include "rmodinit.h"`
40	`#include "sayonara.h"`	40	`#include "sayonara.h"`
41		41
42		42
43	`struct cmd_funcparam {`	43	`struct cmd_funcparam {`
44	`int argc; /* number of arguments */`	44	`int argc; /* number of arguments */`
45	`const char argv[128]; / pointers to each argument */`	45	`const char argv[128]; / pointers to each argument */`
46	`char argvbuf[256]; /* buffer that hold data pointed out by argv[] */`	46	`char argvbuf[256]; /* buffer that hold data pointed out by argv[] */`
47	`unsigned short env_seg; /* segment of environment block */`	47	`unsigned short env_seg; /* segment of environment block */`
48	`struct rmod_props far rmod; / rmod settings */`	48	`struct rmod_props far rmod; / rmod settings */`
49	`unsigned short argoffset; /* offset of cmdline where first argument starts */`	49	`unsigned short argoffset; /* offset of cmdline where first argument starts */`
50	`const char cmdline; / original cmdline (terminated by a NULL) */`	50	`const char cmdline; / original cmdline (terminated by a NULL) */`
51	`unsigned short BUFFERSZ; /* avail space in BUFFER */`	51	`unsigned short BUFFERSZ; /* avail space in BUFFER */`
52	`char BUFFER[1]; /* a buffer for whatever is needed (must be last) */`	52	`char BUFFER[1]; /* a buffer for whatever is needed (must be last) */`
53	`};`	53	`};`
54		54
55	`/* scans argv for the presence of a "/?" parameter. returns 1 if found, 0 otherwise */`	55	`/* scans argv for the presence of a "/?" parameter. returns 1 if found, 0 otherwise */`
56	`static int cmd_ishlp(const struct cmd_funcparam *p) {`	56	`static int cmd_ishlp(const struct cmd_funcparam *p) {`
57	`int i;`	57	`int i;`
58	`for (i = 0; i < p->argc; i++) {`	58	`for (i = 0; i < p->argc; i++) {`
59	`if ((p->argv[i][0] == '/') && (p->argv[i][1] == '?')) return(1);`	59	`if ((p->argv[i][0] == '/') && (p->argv[i][1] == '?')) return(1);`
60	`}`	60	`}`
61	`return(0);`	61	`return(0);`
62	`}`	62	`}`
63		63
64	`#include "cmd/_notimpl.c"`	64	`#include "cmd/_notimpl.c"`
65	`#include "cmd/break.c"`	65	`#include "cmd/break.c"`
66	`#include "cmd/cd.c"`	66	`#include "cmd/cd.c"`
67	`#include "cmd/chcp.c"`	67	`#include "cmd/chcp.c"`
68	`#include "cmd/cls.c"`	68	`#include "cmd/cls.c"`
69	`#include "cmd/copy.c"`	69	`#include "cmd/copy.c"`
70	`#include "cmd/date.c"`	70	`#include "cmd/date.c"`
71	`#include "cmd/del.c"`	71	`#include "cmd/del.c"`
72	`#include "cmd/vol.c" /* must be included before dir.c due to dependency */`	72	`#include "cmd/vol.c" /* must be included before dir.c due to dependency */`
73	`#include "cmd/dir.c"`	73	`#include "cmd/dir.c"`
74	`#include "cmd/echo.c"`	74	`#include "cmd/echo.c"`
75	`#include "cmd/exit.c"`	75	`#include "cmd/exit.c"`
76	`#include "cmd/mkdir.c"`	76	`#include "cmd/mkdir.c"`
77	`#include "cmd/path.c"`	77	`#include "cmd/path.c"`
78	`#include "cmd/pause.c"`	78	`#include "cmd/pause.c"`
79	`#include "cmd/prompt.c"`	79	`#include "cmd/prompt.c"`
80	`#include "cmd/rem.c"`	80	`#include "cmd/rem.c"`
81	`#include "cmd/rename.c"`	81	`#include "cmd/rename.c"`
82	`#include "cmd/rmdir.c"`	82	`#include "cmd/rmdir.c"`
83	`#include "cmd/set.c"`	83	`#include "cmd/set.c"`
-		84	`#include "cmd/shift.c"`
84	`#include "cmd/time.c"`	85	`#include "cmd/time.c"`
85	`#include "cmd/type.c"`	86	`#include "cmd/type.c"`
86	`#include "cmd/ver.c"`	87	`#include "cmd/ver.c"`
87	`#include "cmd/verify.c"`	88	`#include "cmd/verify.c"`
88		89
89	`#include "cmd.h"`	90	`#include "cmd.h"`
90		91
91		92
92	`struct CMD_ID {`	93	`struct CMD_ID {`
93	`const char *cmd;`	94	`const char *cmd;`
94	`int (func_ptr)(struct cmd_funcparam ); /* pointer to handling function */`	95	`int (func_ptr)(struct cmd_funcparam ); /* pointer to handling function */`
95	`};`	96	`};`
96		97
97	`const struct CMD_ID INTERNAL_CMDS[] = {`	98	`const struct CMD_ID INTERNAL_CMDS[] = {`
98	`{"BREAK", cmd_break},`	99	`{"BREAK", cmd_break},`
99	`{"CD", cmd_cd},`	100	`{"CD", cmd_cd},`
100	`{"CHCP", cmd_chcp},`	101	`{"CHCP", cmd_chcp},`
101	`{"CHDIR", cmd_cd},`	102	`{"CHDIR", cmd_cd},`
102	`{"CLS", cmd_cls},`	103	`{"CLS", cmd_cls},`
103	`{"COPY", cmd_copy},`	104	`{"COPY", cmd_copy},`
104	`{"CTTY", cmd_notimpl},`	105	`{"CTTY", cmd_notimpl},`
105	`{"DATE", cmd_date},`	106	`{"DATE", cmd_date},`
106	`{"DEL", cmd_del},`	107	`{"DEL", cmd_del},`
107	`{"DIR", cmd_dir},`	108	`{"DIR", cmd_dir},`
108	`{"ECHO", cmd_echo},`	109	`{"ECHO", cmd_echo},`
109	`{"ERASE", cmd_del},`	110	`{"ERASE", cmd_del},`
110	`{"EXIT", cmd_exit},`	111	`{"EXIT", cmd_exit},`
111	`{"LH", cmd_notimpl},`	112	`{"LH", cmd_notimpl},`
112	`{"LOADHIGH",cmd_notimpl},`	113	`{"LOADHIGH",cmd_notimpl},`
113	`{"MD", cmd_mkdir},`	114	`{"MD", cmd_mkdir},`
114	`{"MKDIR", cmd_mkdir},`	115	`{"MKDIR", cmd_mkdir},`
115	`{"PAUSE", cmd_pause},`	116	`{"PAUSE", cmd_pause},`
116	`{"PATH", cmd_path},`	117	`{"PATH", cmd_path},`
117	`{"PROMPT", cmd_prompt},`	118	`{"PROMPT", cmd_prompt},`
118	`{"RD", cmd_rmdir},`	119	`{"RD", cmd_rmdir},`
119	`{"REM", cmd_rem},`	120	`{"REM", cmd_rem},`
120	`{"REN", cmd_rename},`	121	`{"REN", cmd_rename},`
121	`{"RENAME", cmd_rename},`	122	`{"RENAME", cmd_rename},`
122	`{"RMDIR", cmd_rmdir},`	123	`{"RMDIR", cmd_rmdir},`
123	`{"SET", cmd_set},`	124	`{"SET", cmd_set},`
-		125	`{"SHIFT", cmd_shift},`
124	`{"TIME", cmd_time},`	126	`{"TIME", cmd_time},`
125	`{"TYPE", cmd_type},`	127	`{"TYPE", cmd_type},`
126	`{"VER", cmd_ver},`	128	`{"VER", cmd_ver},`
127	`{"VERIFY", cmd_verify},`	129	`{"VERIFY", cmd_verify},`
128	`{"VOL", cmd_vol},`	130	`{"VOL", cmd_vol},`
129	`{NULL, NULL}`	131	`{NULL, NULL}`
130	`};`	132	`};`
131		133
132		134
133	`/* NULL if cmdline is not matching an internal command, otherwise returns a`	135	`/* NULL if cmdline is not matching an internal command, otherwise returns a`
134	`* pointer to a CMD_ID struct */`	136	`* pointer to a CMD_ID struct */`
135	`static const struct CMD_ID cmd_match(const char cmdline, unsigned short *argoffset) {`	137	`static const struct CMD_ID cmd_match(const char cmdline, unsigned short *argoffset) {`
136	`unsigned short i;`	138	`unsigned short i;`
137	`char buff[10];`	139	`char buff[10];`
138		140
139	`/* copy command to buffer, until space, NULL, tab, return, dot, slash or backslash */`	141	`/* copy command to buffer, until space, NULL, tab, return, dot, slash or backslash */`
140	`for (i = 0; i < 9; i++) {`	142	`for (i = 0; i < 9; i++) {`
141	`if (cmdline[i] == ' ') break;`	143	`if (cmdline[i] == ' ') break;`
142	`if (cmdline[i] == 0) break;`	144	`if (cmdline[i] == 0) break;`
143	`if (cmdline[i] == '\t') break;`	145	`if (cmdline[i] == '\t') break;`
144	`if (cmdline[i] == '\r') break;`	146	`if (cmdline[i] == '\r') break;`
145	`if (cmdline[i] == '.') break;`	147	`if (cmdline[i] == '.') break;`
146	`if (cmdline[i] == '/') break;`	148	`if (cmdline[i] == '/') break;`
147	`if (cmdline[i] == '\\') break;`	149	`if (cmdline[i] == '\\') break;`
148	`buff[i] = cmdline[i];`	150	`buff[i] = cmdline[i];`
149	`}`	151	`}`
150	`buff[i] = 0;`	152	`buff[i] = 0;`
151		153
152	`/* advance to nearest non-space to find where arguments start */`	154	`/* advance to nearest non-space to find where arguments start */`
153	`while (cmdline[i] == ' ') i++;`	155	`while (cmdline[i] == ' ') i++;`
154	`*argoffset = i;`	156	`*argoffset = i;`
155		157
156	`/* try matching an internal command */`	158	`/* try matching an internal command */`
157	`for (i = 0; INTERNAL_CMDS[i].cmd != NULL; i++) {`	159	`for (i = 0; INTERNAL_CMDS[i].cmd != NULL; i++) {`
158	`/printf("imatch(%s,%s)\r\n", buff, INTERNAL_CMDS[i].cmd); /`	160	`/printf("imatch(%s,%s)\r\n", buff, INTERNAL_CMDS[i].cmd); /`
159	`if (imatch(buff, INTERNAL_CMDS[i].cmd)) {`	161	`if (imatch(buff, INTERNAL_CMDS[i].cmd)) {`
160	`/printf("match cmd i=%u (buff=%s)\r\n", i, buff);/`	162	`/printf("match cmd i=%u (buff=%s)\r\n", i, buff);/`
161	`return(&(INTERNAL_CMDS[i]));`	163	`return(&(INTERNAL_CMDS[i]));`
162	`}`	164	`}`
163	`}`	165	`}`
164		166
165	`return(NULL); /* command is not recognized as internal */`	167	`return(NULL); /* command is not recognized as internal */`
166	`}`	168	`}`
167		169
168		170
169	`/* explodes a command into an array of arguments where last arg is NULL.`	171	`/* explodes a command into an array of arguments where last arg is NULL.`
170	`* if argvlist is not NULL, it will be filled with pointers that point to buff`	172	`* if argvlist is not NULL, it will be filled with pointers that point to buff`
171	`* locations. buff is filled with all the arguments, each argument being`	173	`* locations. buff is filled with all the arguments, each argument being`
172	`* zero-separated. buff is terminated with an empty argument to mark the end`	174	`* zero-separated. buff is terminated with an empty argument to mark the end`
173	`* of arguments.`	175	`* of arguments.`
174	`* returns number of args */`	176	`* returns number of args */`
175	`unsigned short cmd_explode(char buff, const char far s, char const **argvlist) {`	177	`unsigned short cmd_explode(char buff, const char far s, char const **argvlist) {`
176	`int si = 0, argc = 0, i = 0;`	178	`int si = 0, argc = 0, i = 0;`
177	`for (;;) {`	179	`for (;;) {`
178	`/* skip to next non-space character */`	180	`/* skip to next non-space character */`
179	`while (s[si] == ' ') si++;`	181	`while (s[si] == ' ') si++;`
180	`/* end of string? */`	182	`/* end of string? */`
181	`if (s[si] == 0) break;`	183	`if (s[si] == 0) break;`
182	`/* set argv ptr */`	184	`/* set argv ptr */`
183	`if (argvlist) argvlist[argc] = buff + i;`	185	`if (argvlist) argvlist[argc] = buff + i;`
184	`argc++;`	186	`argc++;`
185	`/* find next arg delimiter (spc, null, slash or plus) while copying arg to local buffer */`	187	`/* find next arg delimiter (spc, null, slash or plus) while copying arg to local buffer */`
186	`do {`	188	`do {`
187	`buff[i++] = s[si++];`	189	`buff[i++] = s[si++];`
188	`} while (s[si] != ' ' && s[si] != 0 && s[si] != '/' && s[si] != '+');`	190	`} while (s[si] != ' ' && s[si] != 0 && s[si] != '/' && s[si] != '+');`
189	`buff[i++] = 0;`	191	`buff[i++] = 0;`
190	`/* is this end of string? */`	192	`/* is this end of string? */`
191	`if (s[si] == 0) break;`	193	`if (s[si] == 0) break;`
192	`}`	194	`}`
193	`buff[i] = 0; /* terminate with one extra zero to tell "this is the end of list" */`	195	`buff[i] = 0; /* terminate with one extra zero to tell "this is the end of list" */`
194	`if (argvlist) argvlist[argc] = NULL;`	196	`if (argvlist) argvlist[argc] = NULL;`
195	`return(argc);`	197	`return(argc);`
196	`}`	198	`}`
197		199
198		200
199	`int cmd_process(struct rmod_props far rmod, unsigned short env_seg, const char cmdline, void *BUFFER, unsigned short BUFFERSZ) {`	201	`int cmd_process(struct rmod_props far rmod, unsigned short env_seg, const char cmdline, void *BUFFER, unsigned short BUFFERSZ) {`
200	`const struct CMD_ID *cmdptr;`	202	`const struct CMD_ID *cmdptr;`
201	`unsigned short argoffset;`	203	`unsigned short argoffset;`
202	`struct cmd_funcparam p = (void )BUFFER;`	204	`struct cmd_funcparam p = (void )BUFFER;`
203	`p->BUFFERSZ = BUFFERSZ - sizeof(*p);`	205	`p->BUFFERSZ = BUFFERSZ - sizeof(*p);`
204		206
205	`/* special case: is this a drive change? (like "E:") */`	207	`/* special case: is this a drive change? (like "E:") */`
206	`if ((cmdline[0] != 0) && (cmdline[1] == ':') && ((cmdline[2] == ' ') \|\| (cmdline[2] == 0))) {`	208	`if ((cmdline[0] != 0) && (cmdline[1] == ':') && ((cmdline[2] == ' ') \|\| (cmdline[2] == 0))) {`
207	`if (((cmdline[0] >= 'a') && (cmdline[0] <= 'z')) \|\| ((cmdline[0] >= 'A') && (cmdline[0] <= 'Z'))) {`	209	`if (((cmdline[0] >= 'a') && (cmdline[0] <= 'z')) \|\| ((cmdline[0] >= 'A') && (cmdline[0] <= 'Z'))) {`
208	`unsigned char drive = cmdline[0];`	210	`unsigned char drive = cmdline[0];`
209	`unsigned char curdrive = 0;`	211	`unsigned char curdrive = 0;`
210	`if (drive >= 'a') {`	212	`if (drive >= 'a') {`
211	`drive -= 'a';`	213	`drive -= 'a';`
212	`} else {`	214	`} else {`
213	`drive -= 'A';`	215	`drive -= 'A';`
214	`}`	216	`}`
215	`_asm {`	217	`_asm {`
216	`push ax`	218	`push ax`
217	`push dx`	219	`push dx`
218	`mov ah, 0x0e /* DOS 1+ - SELECT DEFAULT DRIVE */`	220	`mov ah, 0x0e /* DOS 1+ - SELECT DEFAULT DRIVE */`
219	`mov dl, drive /* DL = new default drive (00h = A:, 01h = B:, etc) */`	221	`mov dl, drive /* DL = new default drive (00h = A:, 01h = B:, etc) */`
220	`int 0x21`	222	`int 0x21`
221	`mov ah, 0x19 /* DOS 1+ - GET CURRENT DRIVE */`	223	`mov ah, 0x19 /* DOS 1+ - GET CURRENT DRIVE */`
222	`int 0x21`	224	`int 0x21`
223	`mov curdrive, al /* cur drive (0=A, 1=B, etc) */`	225	`mov curdrive, al /* cur drive (0=A, 1=B, etc) */`
224	`pop dx`	226	`pop dx`
225	`pop ax`	227	`pop ax`
226	`}`	228	`}`
227	`if (curdrive != drive) puts(doserr(0x0f));`	229	`if (curdrive != drive) puts(doserr(0x0f));`
228	`return(-1);`	230	`return(-1);`
229	`}`	231	`}`
230	`}`	232	`}`
231		233
232	`/* try matching an internal command */`	234	`/* try matching an internal command */`
233	`cmdptr = cmd_match(cmdline, &argoffset);`	235	`cmdptr = cmd_match(cmdline, &argoffset);`
234	`if (cmdptr == NULL) return(-2); /* command is not recognized as internal */`	236	`if (cmdptr == NULL) return(-2); /* command is not recognized as internal */`
235		237
236	`/* printf("recognized internal command: '%s', tail of command at offset %u\r\n", cmdptr->cmd, argoffset); */`	238	`/* printf("recognized internal command: '%s', tail of command at offset %u\r\n", cmdptr->cmd, argoffset); */`
237		239
238	`/* prepare function parameters and feed it to the cmd handling function */`	240	`/* prepare function parameters and feed it to the cmd handling function */`
239	`p->argc = cmd_explode(p->argvbuf, cmdline + argoffset, p->argv);`	241	`p->argc = cmd_explode(p->argvbuf, cmdline + argoffset, p->argv);`
240	`p->env_seg = env_seg;`	242	`p->env_seg = env_seg;`
241	`p->rmod = rmod;`	243	`p->rmod = rmod;`
242	`p->argoffset = argoffset;`	244	`p->argoffset = argoffset;`
243	`p->cmdline = cmdline;`	245	`p->cmdline = cmdline;`
244		246
245	`return((cmdptr->func_ptr)(p));`	247	`return((cmdptr->func_ptr)(p));`
246	`}`	248	`}`
247		249

Subversion Repositories SvarDOS

(root)/svarcom/trunk/cmd.c @ 508 – Rev 508 → 514