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 "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) */
};
 
#include "cmd/cd.c"
#include "cmd/dir.c"
#include "cmd/exit.c"
#include "cmd/prompt.c"
#include "cmd/set.c"
 
#include "cmd.h"
 
 
struct CMD_ID {
  const char *cmd;
  int (*func_ptr)(const struct cmd_funcparam *); /* pointer to handling function */
};
 
const struct CMD_ID INTERNAL_CMDS[] = {
  {"CD",      cmd_cd},
  {"CHDIR",   cmd_cd},
  {"DIR",     cmd_dir},
  {"EXIT",    cmd_exit},
  {"PROMPT",  cmd_prompt},
  {"SET",     cmd_set},
  {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) {
  const struct CMD_ID *cmdptr;
  struct cmd_funcparam p;
  unsigned short argoffset;
  char cmdbuff[256];
 
  /* 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(cmdbuff, cmdline + argoffset, p.argv);
  p.env_seg = env_seg;
  p.argoffset = argoffset;
  p.cmdline = cmdline;
 
  return((cmdptr->func_ptr)(&p));
}
 

Rev 368	Rev 371
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		9
10	`#include "doserr.h"`	10	`#include "doserr.h"`
-		11	`#include "env.h"`
11	`#include "helpers.h"`	12	`#include "helpers.h"`
12		13
13	`struct cmd_funcparam {`	14	`struct cmd_funcparam {`
14	`int argc;`	15	`int argc; /* number of arguments */`
15	`const char *argv[256];`	16	`const char argv[256]; / pointers to each argument */`
16	`unsigned short env_seg;`	17	`unsigned short env_seg; /* segment of environment block */`
-		18	`unsigned short argoffset; /* offset of cmdline where first argument starts */`
17	`const char far *cmdline;`	19	`const char far cmdline; / original cmdline (terminated by \r) */`
18	`};`	20	`};`
19		21
20	`#include "cmd/cd.c"`	22	`#include "cmd/cd.c"`
21	`#include "cmd/dir.c"`	23	`#include "cmd/dir.c"`
22	`#include "cmd/exit.c"`	24	`#include "cmd/exit.c"`
-		25	`#include "cmd/prompt.c"`
23	`#include "cmd/set.c"`	26	`#include "cmd/set.c"`
24		27
25	`#include "cmd.h"`	28	`#include "cmd.h"`
26		29
27		30
28	`struct CMD_ID {`	31	`struct CMD_ID {`
29	`const char *cmd;`	32	`const char *cmd;`
30	`int (func_ptr)(const struct cmd_funcparam ); /* pointer to handling function */`	33	`int (func_ptr)(const struct cmd_funcparam ); /* pointer to handling function */`
31	`};`	34	`};`
32		35
33	`const struct CMD_ID INTERNAL_CMDS[] = {`	36	`const struct CMD_ID INTERNAL_CMDS[] = {`
34	`{"CD", cmd_cd},`	37	`{"CD", cmd_cd},`
35	`{"CHDIR", cmd_cd},`	38	`{"CHDIR", cmd_cd},`
36	`{"DIR", cmd_dir},`	39	`{"DIR", cmd_dir},`
37	`{"EXIT", cmd_exit},`	40	`{"EXIT", cmd_exit},`
-		41	`{"PROMPT", cmd_prompt},`
38	`{"SET", cmd_set},`	42	`{"SET", cmd_set},`
39	`{NULL, NULL}`	43	`{NULL, NULL}`
40	`};`	44	`};`
41		45
42		46
43	`/* NULL if cmdline is not matching an internal command, otherwise returns a`	47	`/* NULL if cmdline is not matching an internal command, otherwise returns a`
44	`* pointer to a CMD_ID struct */`	48	`* pointer to a CMD_ID struct */`
45	`static const struct CMD_ID cmd_match(const char far cmdline, unsigned short *argoffset) {`	49	`static const struct CMD_ID cmd_match(const char far cmdline, unsigned short *argoffset) {`
46	`unsigned short i;`	50	`unsigned short i;`
47	`char buff[10];`	51	`char buff[10];`
48		52
49	`/* copy command to buffer, until space, NULL, tab, return, dot, slash or backslash */`	53	`/* copy command to buffer, until space, NULL, tab, return, dot, slash or backslash */`
50	`for (i = 0; i < 9; i++) {`	54	`for (i = 0; i < 9; i++) {`
51	`if (cmdline[i] == ' ') break;`	55	`if (cmdline[i] == ' ') break;`
52	`if (cmdline[i] == 0) break;`	56	`if (cmdline[i] == 0) break;`
53	`if (cmdline[i] == '\t') break;`	57	`if (cmdline[i] == '\t') break;`
54	`if (cmdline[i] == '\r') break;`	58	`if (cmdline[i] == '\r') break;`
55	`if (cmdline[i] == '.') break;`	59	`if (cmdline[i] == '.') break;`
56	`if (cmdline[i] == '/') break;`	60	`if (cmdline[i] == '/') break;`
57	`if (cmdline[i] == '\\') break;`	61	`if (cmdline[i] == '\\') break;`
58	`buff[i] = cmdline[i];`	62	`buff[i] = cmdline[i];`
59	`}`	63	`}`
60	`buff[i] = 0;`	64	`buff[i] = 0;`
61		65
62	`/* advance to nearest non-space to find where arguments start */`	66	`/* advance to nearest non-space to find where arguments start */`
63	`while (cmdline[i] == ' ') i++;`	67	`while (cmdline[i] == ' ') i++;`
64	`*argoffset = i;`	68	`*argoffset = i;`
65		69
66	`/* try matching an internal command */`	70	`/* try matching an internal command */`
67	`for (i = 0; INTERNAL_CMDS[i].cmd != NULL; i++) {`	71	`for (i = 0; INTERNAL_CMDS[i].cmd != NULL; i++) {`
68	`/printf("imatch(%s,%s)\r\n", buff, INTERNAL_CMDS[i].cmd); /`	72	`/printf("imatch(%s,%s)\r\n", buff, INTERNAL_CMDS[i].cmd); /`
69	`if (imatch(buff, INTERNAL_CMDS[i].cmd)) {`	73	`if (imatch(buff, INTERNAL_CMDS[i].cmd)) {`
70	`/printf("match cmd i=%u (buff=%s)\r\n", i, buff);/`	74	`/printf("match cmd i=%u (buff=%s)\r\n", i, buff);/`
71	`return(&(INTERNAL_CMDS[i]));`	75	`return(&(INTERNAL_CMDS[i]));`
72	`}`	76	`}`
73	`}`	77	`}`
74		78
75	`return(NULL); /* command is not recognized as internal */`	79	`return(NULL); /* command is not recognized as internal */`
76	`}`	80	`}`
77		81
78		82
79	`/* explodes a command into an array of arguments where last arg is NULL`	83	`/* explodes a command into an array of arguments where last arg is NULL`
80	`* returns number of args */`	84	`* returns number of args */`
81	`unsigned short cmd_explode(char buff, const char far s, char const **argvlist) {`	85	`unsigned short cmd_explode(char buff, const char far s, char const **argvlist) {`
82	`int si = 0, argc = 0, i = 0;`	86	`int si = 0, argc = 0, i = 0;`
83	`for (;;) {`	87	`for (;;) {`
84	`/* skip to next non-space character */`	88	`/* skip to next non-space character */`
85	`while (s[si] == ' ') si++;`	89	`while (s[si] == ' ') si++;`
86	`/* end of string? */`	90	`/* end of string? */`
87	`if (s[si] == 0) break;`	91	`if (s[si] == 0) break;`
88	`/* set argv ptr */`	92	`/* set argv ptr */`
89	`argvlist[argc++] = buff + i;`	93	`argvlist[argc++] = buff + i;`
90	`/* find next space while copying arg to local buffer */`	94	`/* find next space while copying arg to local buffer */`
91	`do {`	95	`do {`
92	`buff[i++] = s[si++];`	96	`buff[i++] = s[si++];`
93	`} while (s[si] != ' ' && s[si] != 0 && s[si] != '/');`	97	`} while (s[si] != ' ' && s[si] != 0 && s[si] != '/');`
94	`buff[i++] = 0;`	98	`buff[i++] = 0;`
95	`/* is this end of string? */`	99	`/* is this end of string? */`
96	`if (s[si] == 0) break;`	100	`if (s[si] == 0) break;`
97	`}`	101	`}`
98	`argvlist[argc] = NULL;`	102	`argvlist[argc] = NULL;`
99	`return(argc);`	103	`return(argc);`
100	`}`	104	`}`
101		105
102		106
103	`int cmd_process(unsigned short env_seg, const char far *cmdline) {`	107	`int cmd_process(unsigned short env_seg, const char far *cmdline) {`
104	`const struct CMD_ID *cmdptr;`	108	`const struct CMD_ID *cmdptr;`
105	`struct cmd_funcparam p;`	109	`struct cmd_funcparam p;`
106	`unsigned short argoffset;`	110	`unsigned short argoffset;`
107	`char cmdbuff[256];`	111	`char cmdbuff[256];`
108		112
109	`/* special case: is this a drive change? (like "E:") */`	113	`/* special case: is this a drive change? (like "E:") */`
110	`if ((cmdline[0] != 0) && (cmdline[1] == ':') && ((cmdline[2] == ' ') \|\| (cmdline[2] == 0))) {`	114	`if ((cmdline[0] != 0) && (cmdline[1] == ':') && ((cmdline[2] == ' ') \|\| (cmdline[2] == 0))) {`
111	`if (((cmdline[0] >= 'a') && (cmdline[0] <= 'z')) \|\| ((cmdline[0] >= 'A') && (cmdline[0] <= 'Z'))) {`	115	`if (((cmdline[0] >= 'a') && (cmdline[0] <= 'z')) \|\| ((cmdline[0] >= 'A') && (cmdline[0] <= 'Z'))) {`
112	`unsigned char drive = cmdline[0];`	116	`unsigned char drive = cmdline[0];`
113	`unsigned char curdrive = 0;`	117	`unsigned char curdrive = 0;`
114	`if (drive >= 'a') {`	118	`if (drive >= 'a') {`
115	`drive -= 'a';`	119	`drive -= 'a';`
116	`} else {`	120	`} else {`
117	`drive -= 'A';`	121	`drive -= 'A';`
118	`}`	122	`}`
119	`_asm {`	123	`_asm {`
120	`push ax`	124	`push ax`
121	`push dx`	125	`push dx`
122	`mov ah, 0x0e /* DOS 1+ - SELECT DEFAULT DRIVE */`	126	`mov ah, 0x0e /* DOS 1+ - SELECT DEFAULT DRIVE */`
123	`mov dl, drive /* DL = new default drive (00h = A:, 01h = B:, etc) */`	127	`mov dl, drive /* DL = new default drive (00h = A:, 01h = B:, etc) */`
124	`int 0x21`	128	`int 0x21`
125	`mov ah, 0x19 /* DOS 1+ - GET CURRENT DRIVE */`	129	`mov ah, 0x19 /* DOS 1+ - GET CURRENT DRIVE */`
126	`int 0x21`	130	`int 0x21`
127	`mov curdrive, al /* cur drive (0=A, 1=B, etc) */`	131	`mov curdrive, al /* cur drive (0=A, 1=B, etc) */`
128	`pop dx`	132	`pop dx`
129	`pop ax`	133	`pop ax`
130	`}`	134	`}`
131	`if (curdrive != drive) puts(doserr(0x0f));`	135	`if (curdrive != drive) puts(doserr(0x0f));`
132	`return(-1);`	136	`return(-1);`
133	`}`	137	`}`
134	`}`	138	`}`
135		139
136	`/* try matching an internal command */`	140	`/* try matching an internal command */`
137	`cmdptr = cmd_match(cmdline, &argoffset);`	141	`cmdptr = cmd_match(cmdline, &argoffset);`
138	`if (cmdptr == NULL) return(-2); /* command is not recognized as internal */`	142	`if (cmdptr == NULL) return(-2); /* command is not recognized as internal */`
139		143
140	`/* printf("recognized internal command: '%s', tail of command at offset %u\r\n", cmdptr->cmd, argoffset); */`	144	`/* printf("recognized internal command: '%s', tail of command at offset %u\r\n", cmdptr->cmd, argoffset); */`
141		145
142	`/* prepare function parameters and feed it to the cmd handling function */`	146	`/* prepare function parameters and feed it to the cmd handling function */`
143	`p.argc = cmd_explode(cmdbuff, cmdline + argoffset, p.argv);`	147	`p.argc = cmd_explode(cmdbuff, cmdline + argoffset, p.argv);`
144	`p.env_seg = env_seg;`	148	`p.env_seg = env_seg;`
-		149	`p.argoffset = argoffset;`
145	`p.cmdline = cmdline;`	150	`p.cmdline = cmdline;`
146		151
147	`return((cmdptr->func_ptr)(&p));`	152	`return((cmdptr->func_ptr)(&p));`
148	`}`	153	`}`
149		154

Subversion Repositories SvarDOS

(root)/svarcom/trunk/cmd.c @ 1100 – Rev 368 → 371