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


/* 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"
 
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 argoffset; /* offset of cmdline where first argument starts */
  const char far *cmdline;  /* original cmdline (terminated by \r) */
  char BUFFER[1024];        /* 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/cd.c"
#include "cmd/del.c"
#include "cmd/vol.c"     /* must be included before dir.c due to dependency */
#include "cmd/dir.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/rmdir.c"
#include "cmd/set.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_notimpl},
  {"CD",      cmd_cd},
  {"CHCP",    cmd_notimpl},
  {"CHDIR",   cmd_cd},
  {"CLS",     cmd_notimpl},
  {"COPY",    cmd_notimpl},
  {"CTTY",    cmd_notimpl},
  {"DATE",    cmd_notimpl},
  {"DEL",     cmd_del},
  {"DIR",     cmd_dir},
  {"ECHO",    cmd_notimpl},
  {"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_notimpl},
  {"RENAME",  cmd_notimpl},
  {"RMDIR",   cmd_rmdir},
  {"SET",     cmd_set},
  {"TIME",    cmd_notimpl},
  {"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 space while copying arg to local buffer */
    do {
      buff[i++] = s[si++];
    } while (s[si] != ' ' && s[si] != 0 && 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 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->argoffset = argoffset;
  p->cmdline = cmdline;
 
  return((cmdptr->func_ptr)(p));
}
 

Rev 399	Rev 400
1	`/* entry point for internal commands`	1	`/* entry point for internal commands`
2	`* matches internal commands and executes them`	2	`* matches internal commands and executes them`
3	`* returns -1 or exit code if processed`	3	`* returns -1 or exit code if processed`
4	`* returns -2 if command unrecognized */`	4	`* returns -2 if command unrecognized */`
5		5
6	`#include <i86.h>`	6	`#include <i86.h>`
7	`#include <stdio.h>`	7	`#include <stdio.h>`
8	`#include <stdlib.h>`	8	`#include <stdlib.h>`
9	`#include <string.h>`	9	`#include <string.h>`
10		10
11	`#include "doserr.h"`	11	`#include "doserr.h"`
12	`#include "env.h"`	12	`#include "env.h"`
13	`#include "helpers.h"`	13	`#include "helpers.h"`
14		14
15	`struct cmd_funcparam {`	15	`struct cmd_funcparam {`
16	`int argc; /* number of arguments */`	16	`int argc; /* number of arguments */`
17	`const char argv[256]; / pointers to each argument */`	17	`const char argv[256]; / pointers to each argument */`
18	`unsigned short env_seg; /* segment of environment block */`	18	`unsigned short env_seg; /* segment of environment block */`
19	`unsigned short argoffset; /* offset of cmdline where first argument starts */`	19	`unsigned short argoffset; /* offset of cmdline where first argument starts */`
20	`const char far cmdline; / original cmdline (terminated by \r) */`	20	`const char far cmdline; / original cmdline (terminated by \r) */`
21	`char BUFFER[1024]; /* a buffer for whatever is needed */`	21	`char BUFFER[1024]; /* a buffer for whatever is needed */`
22	`};`	22	`};`
23		23
24	`/* scans argv for the presence of a "/?" parameter. returns 1 if found, 0 otherwise */`	24	`/* scans argv for the presence of a "/?" parameter. returns 1 if found, 0 otherwise */`
25	`static int cmd_ishlp(const struct cmd_funcparam *p) {`	25	`static int cmd_ishlp(const struct cmd_funcparam *p) {`
26	`int i;`	26	`int i;`
27	`for (i = 0; i < p->argc; i++) {`	27	`for (i = 0; i < p->argc; i++) {`
28	`if ((p->argv[i][0] == '/') && (p->argv[i][1] == '?')) return(1);`	28	`if ((p->argv[i][0] == '/') && (p->argv[i][1] == '?')) return(1);`
29	`}`	29	`}`
30	`return(0);`	30	`return(0);`
31	`}`	31	`}`
32		32
33	`#include "cmd/_notimpl.c"`	33	`#include "cmd/_notimpl.c"`
34	`#include "cmd/cd.c"`	34	`#include "cmd/cd.c"`
35	`#include "cmd/del.c"`	35	`#include "cmd/del.c"`
36	`#include "cmd/vol.c" /* must be included before dir.c due to dependency */`	36	`#include "cmd/vol.c" /* must be included before dir.c due to dependency */`
37	`#include "cmd/dir.c"`	37	`#include "cmd/dir.c"`
38	`#include "cmd/exit.c"`	38	`#include "cmd/exit.c"`
39	`#include "cmd/mkdir.c"`	39	`#include "cmd/mkdir.c"`
40	`#include "cmd/path.c"`	40	`#include "cmd/path.c"`
-		41	`#include "cmd/pause.c"`
41	`#include "cmd/prompt.c"`	42	`#include "cmd/prompt.c"`
-		43	`#include "cmd/rem.c"`
42	`#include "cmd/rmdir.c"`	44	`#include "cmd/rmdir.c"`
43	`#include "cmd/set.c"`	45	`#include "cmd/set.c"`
44	`#include "cmd/type.c"`	46	`#include "cmd/type.c"`
45	`#include "cmd/ver.c"`	47	`#include "cmd/ver.c"`
46	`#include "cmd/verify.c"`	48	`#include "cmd/verify.c"`
47		49
48	`#include "cmd.h"`	50	`#include "cmd.h"`
49		51
50		52
51	`struct CMD_ID {`	53	`struct CMD_ID {`
52	`const char *cmd;`	54	`const char *cmd;`
53	`int (func_ptr)(struct cmd_funcparam ); /* pointer to handling function */`	55	`int (func_ptr)(struct cmd_funcparam ); /* pointer to handling function */`
54	`};`	56	`};`
55		57
56	`const struct CMD_ID INTERNAL_CMDS[] = {`	58	`const struct CMD_ID INTERNAL_CMDS[] = {`
57	`{"BREAK", cmd_notimpl},`	59	`{"BREAK", cmd_notimpl},`
58	`{"CD", cmd_cd},`	60	`{"CD", cmd_cd},`
59	`{"CHCP", cmd_notimpl},`	61	`{"CHCP", cmd_notimpl},`
60	`{"CHDIR", cmd_cd},`	62	`{"CHDIR", cmd_cd},`
61	`{"CLS", cmd_notimpl},`	63	`{"CLS", cmd_notimpl},`
62	`{"COPY", cmd_notimpl},`	64	`{"COPY", cmd_notimpl},`
63	`{"CTTY", cmd_notimpl},`	65	`{"CTTY", cmd_notimpl},`
64	`{"DATE", cmd_notimpl},`	66	`{"DATE", cmd_notimpl},`
65	`{"DEL", cmd_del},`	67	`{"DEL", cmd_del},`
66	`{"DIR", cmd_dir},`	68	`{"DIR", cmd_dir},`
67	`{"ECHO", cmd_notimpl},`	69	`{"ECHO", cmd_notimpl},`
68	`{"ERASE", cmd_del},`	70	`{"ERASE", cmd_del},`
69	`{"EXIT", cmd_exit},`	71	`{"EXIT", cmd_exit},`
70	`{"LH", cmd_notimpl},`	72	`{"LH", cmd_notimpl},`
71	`{"LOADHIGH",cmd_notimpl},`	73	`{"LOADHIGH",cmd_notimpl},`
72	`{"MD", cmd_mkdir},`	74	`{"MD", cmd_mkdir},`
73	`{"MKDIR", cmd_mkdir},`	75	`{"MKDIR", cmd_mkdir},`
74	`{"PAUSE", cmd_notimpl},`	76	`{"PAUSE", cmd_pause},`
75	`{"PATH", cmd_path},`	77	`{"PATH", cmd_path},`
76	`{"PROMPT", cmd_prompt},`	78	`{"PROMPT", cmd_prompt},`
77	`{"RD", cmd_rmdir},`	79	`{"RD", cmd_rmdir},`
-		80	`{"REM", cmd_rem},`
78	`{"REN", cmd_notimpl},`	81	`{"REN", cmd_notimpl},`
79	`{"RENAME", cmd_notimpl},`	82	`{"RENAME", cmd_notimpl},`
80	`{"RMDIR", cmd_rmdir},`	83	`{"RMDIR", cmd_rmdir},`
81	`{"SET", cmd_set},`	84	`{"SET", cmd_set},`
82	`{"TIME", cmd_notimpl},`	85	`{"TIME", cmd_notimpl},`
83	`{"TYPE", cmd_type},`	86	`{"TYPE", cmd_type},`
84	`{"VER", cmd_ver},`	87	`{"VER", cmd_ver},`
85	`{"VERIFY", cmd_verify},`	88	`{"VERIFY", cmd_verify},`
86	`{"VOL", cmd_vol},`	89	`{"VOL", cmd_vol},`
87	`{NULL, NULL}`	90	`{NULL, NULL}`
88	`};`	91	`};`
89		92
90		93
91	`/* NULL if cmdline is not matching an internal command, otherwise returns a`	94	`/* NULL if cmdline is not matching an internal command, otherwise returns a`
92	`* pointer to a CMD_ID struct */`	95	`* pointer to a CMD_ID struct */`
93	`static const struct CMD_ID cmd_match(const char far cmdline, unsigned short *argoffset) {`	96	`static const struct CMD_ID cmd_match(const char far cmdline, unsigned short *argoffset) {`
94	`unsigned short i;`	97	`unsigned short i;`
95	`char buff[10];`	98	`char buff[10];`
96		99
97	`/* copy command to buffer, until space, NULL, tab, return, dot, slash or backslash */`	100	`/* copy command to buffer, until space, NULL, tab, return, dot, slash or backslash */`
98	`for (i = 0; i < 9; i++) {`	101	`for (i = 0; i < 9; i++) {`
99	`if (cmdline[i] == ' ') break;`	102	`if (cmdline[i] == ' ') break;`
100	`if (cmdline[i] == 0) break;`	103	`if (cmdline[i] == 0) break;`
101	`if (cmdline[i] == '\t') break;`	104	`if (cmdline[i] == '\t') break;`
102	`if (cmdline[i] == '\r') break;`	105	`if (cmdline[i] == '\r') break;`
103	`if (cmdline[i] == '.') break;`	106	`if (cmdline[i] == '.') break;`
104	`if (cmdline[i] == '/') break;`	107	`if (cmdline[i] == '/') break;`
105	`if (cmdline[i] == '\\') break;`	108	`if (cmdline[i] == '\\') break;`
106	`buff[i] = cmdline[i];`	109	`buff[i] = cmdline[i];`
107	`}`	110	`}`
108	`buff[i] = 0;`	111	`buff[i] = 0;`
109		112
110	`/* advance to nearest non-space to find where arguments start */`	113	`/* advance to nearest non-space to find where arguments start */`
111	`while (cmdline[i] == ' ') i++;`	114	`while (cmdline[i] == ' ') i++;`
112	`*argoffset = i;`	115	`*argoffset = i;`
113		116
114	`/* try matching an internal command */`	117	`/* try matching an internal command */`
115	`for (i = 0; INTERNAL_CMDS[i].cmd != NULL; i++) {`	118	`for (i = 0; INTERNAL_CMDS[i].cmd != NULL; i++) {`
116	`/printf("imatch(%s,%s)\r\n", buff, INTERNAL_CMDS[i].cmd); /`	119	`/printf("imatch(%s,%s)\r\n", buff, INTERNAL_CMDS[i].cmd); /`
117	`if (imatch(buff, INTERNAL_CMDS[i].cmd)) {`	120	`if (imatch(buff, INTERNAL_CMDS[i].cmd)) {`
118	`/printf("match cmd i=%u (buff=%s)\r\n", i, buff);/`	121	`/printf("match cmd i=%u (buff=%s)\r\n", i, buff);/`
119	`return(&(INTERNAL_CMDS[i]));`	122	`return(&(INTERNAL_CMDS[i]));`
120	`}`	123	`}`
121	`}`	124	`}`
122		125
123	`return(NULL); /* command is not recognized as internal */`	126	`return(NULL); /* command is not recognized as internal */`
124	`}`	127	`}`
125		128
126		129
127	`/* explodes a command into an array of arguments where last arg is NULL`	130	`/* explodes a command into an array of arguments where last arg is NULL`
128	`* returns number of args */`	131	`* returns number of args */`
129	`unsigned short cmd_explode(char buff, const char far s, char const **argvlist) {`	132	`unsigned short cmd_explode(char buff, const char far s, char const **argvlist) {`
130	`int si = 0, argc = 0, i = 0;`	133	`int si = 0, argc = 0, i = 0;`
131	`for (;;) {`	134	`for (;;) {`
132	`/* skip to next non-space character */`	135	`/* skip to next non-space character */`
133	`while (s[si] == ' ') si++;`	136	`while (s[si] == ' ') si++;`
134	`/* end of string? */`	137	`/* end of string? */`
135	`if (s[si] == 0) break;`	138	`if (s[si] == 0) break;`
136	`/* set argv ptr */`	139	`/* set argv ptr */`
137	`argvlist[argc++] = buff + i;`	140	`argvlist[argc++] = buff + i;`
138	`/* find next space while copying arg to local buffer */`	141	`/* find next space while copying arg to local buffer */`
139	`do {`	142	`do {`
140	`buff[i++] = s[si++];`	143	`buff[i++] = s[si++];`
141	`} while (s[si] != ' ' && s[si] != 0 && s[si] != '/');`	144	`} while (s[si] != ' ' && s[si] != 0 && s[si] != '/');`
142	`buff[i++] = 0;`	145	`buff[i++] = 0;`
143	`/* is this end of string? */`	146	`/* is this end of string? */`
144	`if (s[si] == 0) break;`	147	`if (s[si] == 0) break;`
145	`}`	148	`}`
146	`argvlist[argc] = NULL;`	149	`argvlist[argc] = NULL;`
147	`return(argc);`	150	`return(argc);`
148	`}`	151	`}`
149		152
150		153
151	`int cmd_process(unsigned short env_seg, const char far cmdline, char BUFFER) {`	154	`int cmd_process(unsigned short env_seg, const char far cmdline, char BUFFER) {`
152	`const struct CMD_ID *cmdptr;`	155	`const struct CMD_ID *cmdptr;`
153	`unsigned short argoffset;`	156	`unsigned short argoffset;`
154	`struct cmd_funcparam p = (void )BUFFER;`	157	`struct cmd_funcparam p = (void )BUFFER;`
155		158
156	`/* special case: is this a drive change? (like "E:") */`	159	`/* special case: is this a drive change? (like "E:") */`
157	`if ((cmdline[0] != 0) && (cmdline[1] == ':') && ((cmdline[2] == ' ') \|\| (cmdline[2] == 0))) {`	160	`if ((cmdline[0] != 0) && (cmdline[1] == ':') && ((cmdline[2] == ' ') \|\| (cmdline[2] == 0))) {`
158	`if (((cmdline[0] >= 'a') && (cmdline[0] <= 'z')) \|\| ((cmdline[0] >= 'A') && (cmdline[0] <= 'Z'))) {`	161	`if (((cmdline[0] >= 'a') && (cmdline[0] <= 'z')) \|\| ((cmdline[0] >= 'A') && (cmdline[0] <= 'Z'))) {`
159	`unsigned char drive = cmdline[0];`	162	`unsigned char drive = cmdline[0];`
160	`unsigned char curdrive = 0;`	163	`unsigned char curdrive = 0;`
161	`if (drive >= 'a') {`	164	`if (drive >= 'a') {`
162	`drive -= 'a';`	165	`drive -= 'a';`
163	`} else {`	166	`} else {`
164	`drive -= 'A';`	167	`drive -= 'A';`
165	`}`	168	`}`
166	`_asm {`	169	`_asm {`
167	`push ax`	170	`push ax`
168	`push dx`	171	`push dx`
169	`mov ah, 0x0e /* DOS 1+ - SELECT DEFAULT DRIVE */`	172	`mov ah, 0x0e /* DOS 1+ - SELECT DEFAULT DRIVE */`
170	`mov dl, drive /* DL = new default drive (00h = A:, 01h = B:, etc) */`	173	`mov dl, drive /* DL = new default drive (00h = A:, 01h = B:, etc) */`
171	`int 0x21`	174	`int 0x21`
172	`mov ah, 0x19 /* DOS 1+ - GET CURRENT DRIVE */`	175	`mov ah, 0x19 /* DOS 1+ - GET CURRENT DRIVE */`
173	`int 0x21`	176	`int 0x21`
174	`mov curdrive, al /* cur drive (0=A, 1=B, etc) */`	177	`mov curdrive, al /* cur drive (0=A, 1=B, etc) */`
175	`pop dx`	178	`pop dx`
176	`pop ax`	179	`pop ax`
177	`}`	180	`}`
178	`if (curdrive != drive) puts(doserr(0x0f));`	181	`if (curdrive != drive) puts(doserr(0x0f));`
179	`return(-1);`	182	`return(-1);`
180	`}`	183	`}`
181	`}`	184	`}`
182		185
183	`/* try matching an internal command */`	186	`/* try matching an internal command */`
184	`cmdptr = cmd_match(cmdline, &argoffset);`	187	`cmdptr = cmd_match(cmdline, &argoffset);`
185	`if (cmdptr == NULL) return(-2); /* command is not recognized as internal */`	188	`if (cmdptr == NULL) return(-2); /* command is not recognized as internal */`
186		189
187	`/* printf("recognized internal command: '%s', tail of command at offset %u\r\n", cmdptr->cmd, argoffset); */`	190	`/* printf("recognized internal command: '%s', tail of command at offset %u\r\n", cmdptr->cmd, argoffset); */`
188		191
189	`/* prepare function parameters and feed it to the cmd handling function */`	192	`/* prepare function parameters and feed it to the cmd handling function */`
190	`p->argc = cmd_explode(BUFFER + sizeof(*p), cmdline + argoffset, p->argv);`	193	`p->argc = cmd_explode(BUFFER + sizeof(*p), cmdline + argoffset, p->argv);`
191	`p->env_seg = env_seg;`	194	`p->env_seg = env_seg;`
192	`p->argoffset = argoffset;`	195	`p->argoffset = argoffset;`
193	`p->cmdline = cmdline;`	196	`p->cmdline = cmdline;`
194		197
195	`return((cmdptr->func_ptr)(p));`	198	`return((cmdptr->func_ptr)(p));`
196	`}`	199	`}`
197		200

Subversion Repositories SvarDOS

(root)/svarcom/trunk/cmd.c – Rev 399 → 400