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 "helpers.h"
 
struct cmd_funcparam {
  int argc;
  const char *argv[256];
  unsigned short env_seg;
  const char far *cmdline;
};
 
#include "cmd/cd.c"
#include "cmd/exit.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},
  {"EXIT",    cmd_exit},
  {"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.cmdline = cmdline;
 
  return((cmdptr->func_ptr)(&p));
}
 

Rev 364	Rev 365
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 "helpers.h"`	11	`#include "helpers.h"`
12		12
13	`struct cmd_funcparam {`	13	`struct cmd_funcparam {`
14	`int argc;`	14	`int argc;`
15	`const char *argv[256];`	15	`const char *argv[256];`
16	`unsigned short env_seg;`	16	`unsigned short env_seg;`
17	`const char far *cmdline;`	17	`const char far *cmdline;`
18	`};`	18	`};`
19		19
20	`#include "cmd/cd.c"`	20	`#include "cmd/cd.c"`
21	`#include "cmd/exit.c"`	21	`#include "cmd/exit.c"`
22	`#include "cmd/set.c"`	22	`#include "cmd/set.c"`
23		23
24	`#include "cmd.h"`	24	`#include "cmd.h"`
25		25
26		26
27	`struct CMD_ID {`	27	`struct CMD_ID {`
28	`const char *cmd;`	28	`const char *cmd;`
29	`int (func_ptr)(const struct cmd_funcparam ); /* pointer to handling function */`	29	`int (func_ptr)(const struct cmd_funcparam ); /* pointer to handling function */`
30	`};`	30	`};`
31		31
32	`const struct CMD_ID INTERNAL_CMDS[] = {`	32	`const struct CMD_ID INTERNAL_CMDS[] = {`
33	`{"CD", cmd_cd},`	33	`{"CD", cmd_cd},`
34	`{"CHDIR", cmd_cd},`	34	`{"CHDIR", cmd_cd},`
35	`{"EXIT", cmd_exit},`	35	`{"EXIT", cmd_exit},`
36	`{"SET", cmd_set},`	36	`{"SET", cmd_set},`
37	`{NULL, NULL}`	37	`{NULL, NULL}`
38	`};`	38	`};`
39		39
40		40
41	`/* NULL if cmdline is not matching an internal command, otherwise returns a`	41	`/* NULL if cmdline is not matching an internal command, otherwise returns a`
42	`* pointer to a CMD_ID struct */`	42	`* pointer to a CMD_ID struct */`
43	`static const struct CMD_ID cmd_match(const char far cmdline, unsigned short *argoffset) {`	43	`static const struct CMD_ID cmd_match(const char far cmdline, unsigned short *argoffset) {`
44	`unsigned short i;`	44	`unsigned short i;`
45	`char buff[10];`	45	`char buff[10];`
46		46
47	`/* copy command to buffer, until space, NULL, tab, return, dot, slash or backslash */`	47	`/* copy command to buffer, until space, NULL, tab, return, dot, slash or backslash */`
48	`for (i = 0; i < 9; i++) {`	48	`for (i = 0; i < 9; i++) {`
49	`if (cmdline[i] == ' ') break;`	49	`if (cmdline[i] == ' ') break;`
50	`if (cmdline[i] == 0) break;`	50	`if (cmdline[i] == 0) break;`
51	`if (cmdline[i] == '\t') break;`	51	`if (cmdline[i] == '\t') break;`
52	`if (cmdline[i] == '\r') break;`	52	`if (cmdline[i] == '\r') break;`
53	`if (cmdline[i] == '.') break;`	53	`if (cmdline[i] == '.') break;`
54	`if (cmdline[i] == '/') break;`	54	`if (cmdline[i] == '/') break;`
55	`if (cmdline[i] == '\\') break;`	55	`if (cmdline[i] == '\\') break;`
56	`buff[i] = cmdline[i];`	56	`buff[i] = cmdline[i];`
57	`}`	57	`}`
58	`buff[i] = 0;`	58	`buff[i] = 0;`
59		59
60	`/* advance to nearest non-space to find where arguments start */`	60	`/* advance to nearest non-space to find where arguments start */`
61	`while (cmdline[i] == ' ') i++;`	61	`while (cmdline[i] == ' ') i++;`
62	`*argoffset = i;`	62	`*argoffset = i;`
63		63
64	`/* try matching an internal command */`	64	`/* try matching an internal command */`
65	`for (i = 0; INTERNAL_CMDS[i].cmd != NULL; i++) {`	65	`for (i = 0; INTERNAL_CMDS[i].cmd != NULL; i++) {`
66	`/printf("imatch(%s,%s)\r\n", buff, INTERNAL_CMDS[i].cmd); /`	66	`/printf("imatch(%s,%s)\r\n", buff, INTERNAL_CMDS[i].cmd); /`
67	`if (imatch(buff, INTERNAL_CMDS[i].cmd)) {`	67	`if (imatch(buff, INTERNAL_CMDS[i].cmd)) {`
68	`/printf("match cmd i=%u (buff=%s)\r\n", i, buff);/`	68	`/printf("match cmd i=%u (buff=%s)\r\n", i, buff);/`
69	`return(&(INTERNAL_CMDS[i]));`	69	`return(&(INTERNAL_CMDS[i]));`
70	`}`	70	`}`
71	`}`	71	`}`
72		72
73	`return(NULL); /* command is not recognized as internal */`	73	`return(NULL); /* command is not recognized as internal */`
74	`}`	74	`}`
75		75
76		76
77	`/* explodes a command into an array of arguments where last arg is NULL`	77	`/* explodes a command into an array of arguments where last arg is NULL`
78	`* returns number of args */`	78	`* returns number of args */`
79	`unsigned short cmd_explode(char buff, const char far s, char const **argvlist) {`	79	`unsigned short cmd_explode(char buff, const char far s, char const **argvlist) {`
80	`int si = 0, argc = 0, i = 0;`	80	`int si = 0, argc = 0, i = 0;`
81	`for (;;) {`	81	`for (;;) {`
82	`/* skip to next non-space character */`	82	`/* skip to next non-space character */`
83	`while (s[si] == ' ') si++;`	83	`while (s[si] == ' ') si++;`
84	`/* end of string? */`	84	`/* end of string? */`
85	`if (s[si] == 0) break;`	85	`if (s[si] == 0) break;`
86	`/* set argv ptr */`	86	`/* set argv ptr */`
87	`argvlist[argc++] = buff + i;`	87	`argvlist[argc++] = buff + i;`
88	`/* find next space while copying arg to local buffer */`	88	`/* find next space while copying arg to local buffer */`
89	`do {`	89	`do {`
90	`buff[i++] = s[si++];`	90	`buff[i++] = s[si++];`
91	`} while (s[si] != ' ' && s[si] != 0 && s[si] != '/');`	91	`} while (s[si] != ' ' && s[si] != 0 && s[si] != '/');`
92	`buff[i++] = 0;`	92	`buff[i++] = 0;`
93	`/* is this end of string? */`	93	`/* is this end of string? */`
94	`if (s[si] == 0) break;`	94	`if (s[si] == 0) break;`
95	`}`	95	`}`
96	`argvlist[argc] = NULL;`	96	`argvlist[argc] = NULL;`
97	`return(argc);`	97	`return(argc);`
98	`}`	98	`}`
99		99
100		100
101	`int cmd_process(unsigned short env_seg, const char far *cmdline) {`	101	`int cmd_process(unsigned short env_seg, const char far *cmdline) {`
102	`const struct CMD_ID *cmdptr;`	102	`const struct CMD_ID *cmdptr;`
103	`struct cmd_funcparam p;`	103	`struct cmd_funcparam p;`
104	`unsigned short argoffset;`	104	`unsigned short argoffset;`
105	`char cmdbuff[256];`	105	`char cmdbuff[256];`
106		106
-		107	`/* special case: is this a drive change? (like "E:") */`
-		108	`if ((cmdline[0] != 0) && (cmdline[1] == ':') && ((cmdline[2] == ' ') \|\| (cmdline[2] == 0))) {`
-		109	`if (((cmdline[0] >= 'a') && (cmdline[0] <= 'z')) \|\| ((cmdline[0] >= 'A') && (cmdline[0] <= 'Z'))) {`
-		110	`unsigned char drive = cmdline[0];`
-		111	`unsigned char curdrive = 0;`
-		112	`if (drive >= 'a') {`
-		113	`drive -= 'a';`
-		114	`} else {`
-		115	`drive -= 'A';`
-		116	`}`
-		117	`_asm {`
-		118	`push ax`
-		119	`push dx`
-		120	`mov ah, 0x0e /* DOS 1+ - SELECT DEFAULT DRIVE */`
-		121	`mov dl, drive /* DL = new default drive (00h = A:, 01h = B:, etc) */`
-		122	`int 0x21`
-		123	`mov ah, 0x19 /* DOS 1+ - GET CURRENT DRIVE */`
-		124	`int 0x21`
-		125	`mov curdrive, al /* cur drive (0=A, 1=B, etc) */`
-		126	`pop dx`
-		127	`pop ax`
-		128	`}`
-		129	`if (curdrive != drive) puts(doserr(0x0f));`
-		130	`return(-1);`
-		131	`}`
-		132	`}`
-		133
-		134	`/* try matching an internal command */`
107	`cmdptr = cmd_match(cmdline, &argoffset);`	135	`cmdptr = cmd_match(cmdline, &argoffset);`
108	`if (cmdptr == NULL) return(-2); /* command is not recognized as internal */`	136	`if (cmdptr == NULL) return(-2); /* command is not recognized as internal */`
109		137
110	`/* printf("recognized internal command: '%s', tail of command at offset %u\r\n", cmdptr->cmd, argoffset); */`	138	`/* printf("recognized internal command: '%s', tail of command at offset %u\r\n", cmdptr->cmd, argoffset); */`
111		139
112	`/* prepare function parameters and feed it to the cmd handling function */`	140	`/* prepare function parameters and feed it to the cmd handling function */`
113	`p.argc = cmd_explode(cmdbuff, cmdline + argoffset, p.argv);`	141	`p.argc = cmd_explode(cmdbuff, cmdline + argoffset, p.argv);`
114	`p.env_seg = env_seg;`	142	`p.env_seg = env_seg;`
115	`p.cmdline = cmdline;`	143	`p.cmdline = cmdline;`
116		144
117	`return((cmdptr->func_ptr)(&p));`	145	`return((cmdptr->func_ptr)(&p));`
118	`}`	146	`}`
119		147

Subversion Repositories SvarDOS

(root)/svarcom/trunk/cmd.c @ 457 – Rev 364 → 365