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"
 
#define BUFFER_SIZE 2048    /* make sure this is not bigger than the static buffer in command.c */
 
struct cmd_funcparam {
  int argc;                 /* number of arguments */
  const char *argv[256];    /* pointers to each argument */
  unsigned short env_seg;   /* segment of environment block */
  unsigned short rmod_seg;  /* segment of the resident module */
  unsigned short argoffset; /* offset of cmdline where first argument starts */
  const char far *cmdline;  /* original cmdline (terminated by a NULL) */
  char BUFFER[BUFFER_SIZE]; /* a buffer for whatever is needed */
};
 
/* 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/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},
  {"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 far *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
 * 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 */
    argvlist[argc++] = buff + i;
    /* 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;
  }
  argvlist[argc] = NULL;
  return(argc);
}
 
 
int cmd_process(unsigned short rmod_seg, unsigned short env_seg, const char far *cmdline, char *BUFFER) {
  const struct CMD_ID *cmdptr;
  unsigned short argoffset;
  struct cmd_funcparam *p = (void *)BUFFER;
 
  /* 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(BUFFER + sizeof(*p), cmdline + argoffset, p->argv);
  p->env_seg = env_seg;
  p->rmod_seg = rmod_seg;
  p->argoffset = argoffset;
  p->cmdline = cmdline;
 
  return((cmdptr->func_ptr)(p));
}
 

Rev 427	Rev 431
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		40
41	`#define BUFFER_SIZE 2048 /* make sure this is not bigger than the static buffer in command.c */`	41	`#define BUFFER_SIZE 2048 /* make sure this is not bigger than the static buffer in command.c */`
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[256]; / pointers to each argument */`	45	`const char argv[256]; / pointers to each argument */`
46	`unsigned short env_seg; /* segment of environment block */`	46	`unsigned short env_seg; /* segment of environment block */`
47	`unsigned short rmod_seg; /* segment of the resident module */`	47	`unsigned short rmod_seg; /* segment of the resident module */`
48	`unsigned short argoffset; /* offset of cmdline where first argument starts */`	48	`unsigned short argoffset; /* offset of cmdline where first argument starts */`
49	`const char far cmdline; / original cmdline (terminated by a NULL) */`	49	`const char far cmdline; / original cmdline (terminated by a NULL) */`
50	`char BUFFER[BUFFER_SIZE]; /* a buffer for whatever is needed */`	50	`char BUFFER[BUFFER_SIZE]; /* a buffer for whatever is needed */`
51	`};`	51	`};`
52		52
53	`/* scans argv for the presence of a "/?" parameter. returns 1 if found, 0 otherwise */`	53	`/* scans argv for the presence of a "/?" parameter. returns 1 if found, 0 otherwise */`
54	`static int cmd_ishlp(const struct cmd_funcparam *p) {`	54	`static int cmd_ishlp(const struct cmd_funcparam *p) {`
55	`int i;`	55	`int i;`
56	`for (i = 0; i < p->argc; i++) {`	56	`for (i = 0; i < p->argc; i++) {`
57	`if ((p->argv[i][0] == '/') && (p->argv[i][1] == '?')) return(1);`	57	`if ((p->argv[i][0] == '/') && (p->argv[i][1] == '?')) return(1);`
58	`}`	58	`}`
59	`return(0);`	59	`return(0);`
60	`}`	60	`}`
61		61
62	`#include "cmd/_notimpl.c"`	62	`#include "cmd/_notimpl.c"`
63	`#include "cmd/break.c"`	63	`#include "cmd/break.c"`
64	`#include "cmd/cd.c"`	64	`#include "cmd/cd.c"`
65	`#include "cmd/chcp.c"`	65	`#include "cmd/chcp.c"`
66	`#include "cmd/cls.c"`	66	`#include "cmd/cls.c"`
67	`#include "cmd/copy.c"`	67	`#include "cmd/copy.c"`
-		68	`#include "cmd/date.c"`
68	`#include "cmd/del.c"`	69	`#include "cmd/del.c"`
69	`#include "cmd/vol.c" /* must be included before dir.c due to dependency */`	70	`#include "cmd/vol.c" /* must be included before dir.c due to dependency */`
70	`#include "cmd/dir.c"`	71	`#include "cmd/dir.c"`
71	`#include "cmd/echo.c"`	72	`#include "cmd/echo.c"`
72	`#include "cmd/exit.c"`	73	`#include "cmd/exit.c"`
73	`#include "cmd/mkdir.c"`	74	`#include "cmd/mkdir.c"`
74	`#include "cmd/path.c"`	75	`#include "cmd/path.c"`
75	`#include "cmd/pause.c"`	76	`#include "cmd/pause.c"`
76	`#include "cmd/prompt.c"`	77	`#include "cmd/prompt.c"`
77	`#include "cmd/rem.c"`	78	`#include "cmd/rem.c"`
78	`#include "cmd/rename.c"`	79	`#include "cmd/rename.c"`
79	`#include "cmd/rmdir.c"`	80	`#include "cmd/rmdir.c"`
80	`#include "cmd/set.c"`	81	`#include "cmd/set.c"`
81	`#include "cmd/time.c"`	82	`#include "cmd/time.c"`
82	`#include "cmd/type.c"`	83	`#include "cmd/type.c"`
83	`#include "cmd/ver.c"`	84	`#include "cmd/ver.c"`
84	`#include "cmd/verify.c"`	85	`#include "cmd/verify.c"`
85		86
86	`#include "cmd.h"`	87	`#include "cmd.h"`
87		88
88		89
89	`struct CMD_ID {`	90	`struct CMD_ID {`
90	`const char *cmd;`	91	`const char *cmd;`
91	`int (func_ptr)(struct cmd_funcparam ); /* pointer to handling function */`	92	`int (func_ptr)(struct cmd_funcparam ); /* pointer to handling function */`
92	`};`	93	`};`
93		94
94	`const struct CMD_ID INTERNAL_CMDS[] = {`	95	`const struct CMD_ID INTERNAL_CMDS[] = {`
95	`{"BREAK", cmd_break},`	96	`{"BREAK", cmd_break},`
96	`{"CD", cmd_cd},`	97	`{"CD", cmd_cd},`
97	`{"CHCP", cmd_chcp},`	98	`{"CHCP", cmd_chcp},`
98	`{"CHDIR", cmd_cd},`	99	`{"CHDIR", cmd_cd},`
99	`{"CLS", cmd_cls},`	100	`{"CLS", cmd_cls},`
100	`{"COPY", cmd_copy},`	101	`{"COPY", cmd_copy},`
101	`{"CTTY", cmd_notimpl},`	102	`{"CTTY", cmd_notimpl},`
102	`{"DATE", cmd_notimpl},`	103	`{"DATE", cmd_date},`
103	`{"DEL", cmd_del},`	104	`{"DEL", cmd_del},`
104	`{"DIR", cmd_dir},`	105	`{"DIR", cmd_dir},`
105	`{"ECHO", cmd_echo},`	106	`{"ECHO", cmd_echo},`
106	`{"ERASE", cmd_del},`	107	`{"ERASE", cmd_del},`
107	`{"EXIT", cmd_exit},`	108	`{"EXIT", cmd_exit},`
108	`{"LH", cmd_notimpl},`	109	`{"LH", cmd_notimpl},`
109	`{"LOADHIGH",cmd_notimpl},`	110	`{"LOADHIGH",cmd_notimpl},`
110	`{"MD", cmd_mkdir},`	111	`{"MD", cmd_mkdir},`
111	`{"MKDIR", cmd_mkdir},`	112	`{"MKDIR", cmd_mkdir},`
112	`{"PAUSE", cmd_pause},`	113	`{"PAUSE", cmd_pause},`
113	`{"PATH", cmd_path},`	114	`{"PATH", cmd_path},`
114	`{"PROMPT", cmd_prompt},`	115	`{"PROMPT", cmd_prompt},`
115	`{"RD", cmd_rmdir},`	116	`{"RD", cmd_rmdir},`
116	`{"REM", cmd_rem},`	117	`{"REM", cmd_rem},`
117	`{"REN", cmd_rename},`	118	`{"REN", cmd_rename},`
118	`{"RENAME", cmd_rename},`	119	`{"RENAME", cmd_rename},`
119	`{"RMDIR", cmd_rmdir},`	120	`{"RMDIR", cmd_rmdir},`
120	`{"SET", cmd_set},`	121	`{"SET", cmd_set},`
121	`{"TIME", cmd_time},`	122	`{"TIME", cmd_time},`
122	`{"TYPE", cmd_type},`	123	`{"TYPE", cmd_type},`
123	`{"VER", cmd_ver},`	124	`{"VER", cmd_ver},`
124	`{"VERIFY", cmd_verify},`	125	`{"VERIFY", cmd_verify},`
125	`{"VOL", cmd_vol},`	126	`{"VOL", cmd_vol},`
126	`{NULL, NULL}`	127	`{NULL, NULL}`
127	`};`	128	`};`
128		129
129		130
130	`/* NULL if cmdline is not matching an internal command, otherwise returns a`	131	`/* NULL if cmdline is not matching an internal command, otherwise returns a`
131	`* pointer to a CMD_ID struct */`	132	`* pointer to a CMD_ID struct */`
132	`static const struct CMD_ID cmd_match(const char far cmdline, unsigned short *argoffset) {`	133	`static const struct CMD_ID cmd_match(const char far cmdline, unsigned short *argoffset) {`
133	`unsigned short i;`	134	`unsigned short i;`
134	`char buff[10];`	135	`char buff[10];`
135		136
136	`/* copy command to buffer, until space, NULL, tab, return, dot, slash or backslash */`	137	`/* copy command to buffer, until space, NULL, tab, return, dot, slash or backslash */`
137	`for (i = 0; i < 9; i++) {`	138	`for (i = 0; i < 9; i++) {`
138	`if (cmdline[i] == ' ') break;`	139	`if (cmdline[i] == ' ') break;`
139	`if (cmdline[i] == 0) break;`	140	`if (cmdline[i] == 0) break;`
140	`if (cmdline[i] == '\t') break;`	141	`if (cmdline[i] == '\t') break;`
141	`if (cmdline[i] == '\r') break;`	142	`if (cmdline[i] == '\r') break;`
142	`if (cmdline[i] == '.') break;`	143	`if (cmdline[i] == '.') break;`
143	`if (cmdline[i] == '/') break;`	144	`if (cmdline[i] == '/') break;`
144	`if (cmdline[i] == '\\') break;`	145	`if (cmdline[i] == '\\') break;`
145	`buff[i] = cmdline[i];`	146	`buff[i] = cmdline[i];`
146	`}`	147	`}`
147	`buff[i] = 0;`	148	`buff[i] = 0;`
148		149
149	`/* advance to nearest non-space to find where arguments start */`	150	`/* advance to nearest non-space to find where arguments start */`
150	`while (cmdline[i] == ' ') i++;`	151	`while (cmdline[i] == ' ') i++;`
151	`*argoffset = i;`	152	`*argoffset = i;`
152		153
153	`/* try matching an internal command */`	154	`/* try matching an internal command */`
154	`for (i = 0; INTERNAL_CMDS[i].cmd != NULL; i++) {`	155	`for (i = 0; INTERNAL_CMDS[i].cmd != NULL; i++) {`
155	`/printf("imatch(%s,%s)\r\n", buff, INTERNAL_CMDS[i].cmd); /`	156	`/printf("imatch(%s,%s)\r\n", buff, INTERNAL_CMDS[i].cmd); /`
156	`if (imatch(buff, INTERNAL_CMDS[i].cmd)) {`	157	`if (imatch(buff, INTERNAL_CMDS[i].cmd)) {`
157	`/printf("match cmd i=%u (buff=%s)\r\n", i, buff);/`	158	`/printf("match cmd i=%u (buff=%s)\r\n", i, buff);/`
158	`return(&(INTERNAL_CMDS[i]));`	159	`return(&(INTERNAL_CMDS[i]));`
159	`}`	160	`}`
160	`}`	161	`}`
161		162
162	`return(NULL); /* command is not recognized as internal */`	163	`return(NULL); /* command is not recognized as internal */`
163	`}`	164	`}`
164		165
165		166
166	`/* explodes a command into an array of arguments where last arg is NULL`	167	`/* explodes a command into an array of arguments where last arg is NULL`
167	`* returns number of args */`	168	`* returns number of args */`
168	`unsigned short cmd_explode(char buff, const char far s, char const **argvlist) {`	169	`unsigned short cmd_explode(char buff, const char far s, char const **argvlist) {`
169	`int si = 0, argc = 0, i = 0;`	170	`int si = 0, argc = 0, i = 0;`
170	`for (;;) {`	171	`for (;;) {`
171	`/* skip to next non-space character */`	172	`/* skip to next non-space character */`
172	`while (s[si] == ' ') si++;`	173	`while (s[si] == ' ') si++;`
173	`/* end of string? */`	174	`/* end of string? */`
174	`if (s[si] == 0) break;`	175	`if (s[si] == 0) break;`
175	`/* set argv ptr */`	176	`/* set argv ptr */`
176	`argvlist[argc++] = buff + i;`	177	`argvlist[argc++] = buff + i;`
177	`/* find next arg delimiter (spc, null, slash or plus) while copying arg to local buffer */`	178	`/* find next arg delimiter (spc, null, slash or plus) while copying arg to local buffer */`
178	`do {`	179	`do {`
179	`buff[i++] = s[si++];`	180	`buff[i++] = s[si++];`
180	`} while (s[si] != ' ' && s[si] != 0 && s[si] != '/' && s[si] != '+');`	181	`} while (s[si] != ' ' && s[si] != 0 && s[si] != '/' && s[si] != '+');`
181	`buff[i++] = 0;`	182	`buff[i++] = 0;`
182	`/* is this end of string? */`	183	`/* is this end of string? */`
183	`if (s[si] == 0) break;`	184	`if (s[si] == 0) break;`
184	`}`	185	`}`
185	`argvlist[argc] = NULL;`	186	`argvlist[argc] = NULL;`
186	`return(argc);`	187	`return(argc);`
187	`}`	188	`}`
188		189
189		190
190	`int cmd_process(unsigned short rmod_seg, unsigned short env_seg, const char far cmdline, char BUFFER) {`	191	`int cmd_process(unsigned short rmod_seg, unsigned short env_seg, const char far cmdline, char BUFFER) {`
191	`const struct CMD_ID *cmdptr;`	192	`const struct CMD_ID *cmdptr;`
192	`unsigned short argoffset;`	193	`unsigned short argoffset;`
193	`struct cmd_funcparam p = (void )BUFFER;`	194	`struct cmd_funcparam p = (void )BUFFER;`
194		195
195	`/* special case: is this a drive change? (like "E:") */`	196	`/* special case: is this a drive change? (like "E:") */`
196	`if ((cmdline[0] != 0) && (cmdline[1] == ':') && ((cmdline[2] == ' ') \|\| (cmdline[2] == 0))) {`	197	`if ((cmdline[0] != 0) && (cmdline[1] == ':') && ((cmdline[2] == ' ') \|\| (cmdline[2] == 0))) {`
197	`if (((cmdline[0] >= 'a') && (cmdline[0] <= 'z')) \|\| ((cmdline[0] >= 'A') && (cmdline[0] <= 'Z'))) {`	198	`if (((cmdline[0] >= 'a') && (cmdline[0] <= 'z')) \|\| ((cmdline[0] >= 'A') && (cmdline[0] <= 'Z'))) {`
198	`unsigned char drive = cmdline[0];`	199	`unsigned char drive = cmdline[0];`
199	`unsigned char curdrive = 0;`	200	`unsigned char curdrive = 0;`
200	`if (drive >= 'a') {`	201	`if (drive >= 'a') {`
201	`drive -= 'a';`	202	`drive -= 'a';`
202	`} else {`	203	`} else {`
203	`drive -= 'A';`	204	`drive -= 'A';`
204	`}`	205	`}`
205	`_asm {`	206	`_asm {`
206	`push ax`	207	`push ax`
207	`push dx`	208	`push dx`
208	`mov ah, 0x0e /* DOS 1+ - SELECT DEFAULT DRIVE */`	209	`mov ah, 0x0e /* DOS 1+ - SELECT DEFAULT DRIVE */`
209	`mov dl, drive /* DL = new default drive (00h = A:, 01h = B:, etc) */`	210	`mov dl, drive /* DL = new default drive (00h = A:, 01h = B:, etc) */`
210	`int 0x21`	211	`int 0x21`
211	`mov ah, 0x19 /* DOS 1+ - GET CURRENT DRIVE */`	212	`mov ah, 0x19 /* DOS 1+ - GET CURRENT DRIVE */`
212	`int 0x21`	213	`int 0x21`
213	`mov curdrive, al /* cur drive (0=A, 1=B, etc) */`	214	`mov curdrive, al /* cur drive (0=A, 1=B, etc) */`
214	`pop dx`	215	`pop dx`
215	`pop ax`	216	`pop ax`
216	`}`	217	`}`
217	`if (curdrive != drive) puts(doserr(0x0f));`	218	`if (curdrive != drive) puts(doserr(0x0f));`
218	`return(-1);`	219	`return(-1);`
219	`}`	220	`}`
220	`}`	221	`}`
221		222
222	`/* try matching an internal command */`	223	`/* try matching an internal command */`
223	`cmdptr = cmd_match(cmdline, &argoffset);`	224	`cmdptr = cmd_match(cmdline, &argoffset);`
224	`if (cmdptr == NULL) return(-2); /* command is not recognized as internal */`	225	`if (cmdptr == NULL) return(-2); /* command is not recognized as internal */`
225		226
226	`/* printf("recognized internal command: '%s', tail of command at offset %u\r\n", cmdptr->cmd, argoffset); */`	227	`/* printf("recognized internal command: '%s', tail of command at offset %u\r\n", cmdptr->cmd, argoffset); */`
227		228
228	`/* prepare function parameters and feed it to the cmd handling function */`	229	`/* prepare function parameters and feed it to the cmd handling function */`
229	`p->argc = cmd_explode(BUFFER + sizeof(*p), cmdline + argoffset, p->argv);`	230	`p->argc = cmd_explode(BUFFER + sizeof(*p), cmdline + argoffset, p->argv);`
230	`p->env_seg = env_seg;`	231	`p->env_seg = env_seg;`
231	`p->rmod_seg = rmod_seg;`	232	`p->rmod_seg = rmod_seg;`
232	`p->argoffset = argoffset;`	233	`p->argoffset = argoffset;`
233	`p->cmdline = cmdline;`	234	`p->cmdline = cmdline;`
234		235
235	`return((cmdptr->func_ptr)(p));`	236	`return((cmdptr->func_ptr)(p));`
236	`}`	237	`}`
237		238

Subversion Repositories SvarDOS

(root)/svarcom/trunk/cmd.c @ 1095 – Rev 427 → 431