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/dir.c"
#include "cmd/exit.c"
#include "cmd/mkdir.c"
#include "cmd/path.c"
#include "cmd/prompt.c"
#include "cmd/rmdir.c"
#include "cmd/set.c"
#include "cmd/ver.c"
#include "cmd/verify.c"
#include "cmd/type.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_notimpl},
  {"DIR",     cmd_dir},
  {"ECHO",    cmd_notimpl},
  {"ERASE",   cmd_notimpl},
  {"EXIT",    cmd_exit},
  {"LH",      cmd_notimpl},
  {"LOADHIGH",cmd_notimpl},
  {"MD",      cmd_mkdir},
  {"MKDIR",   cmd_mkdir},
  {"PAUSE",   cmd_notimpl},
  {"PATH",    cmd_path},
  {"PROMPT",  cmd_prompt},
  {"RD",      cmd_rmdir},
  {"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_notimpl},
  {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 386	Rev 387
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 */`
-		25	`static int cmd_ishlp(const struct cmd_funcparam *p) {`
-		26	`int i;`
-		27	`for (i = 0; i < p->argc; i++) {`
-		28	`if ((p->argv[i][0] == '/') && (p->argv[i][1] == '?')) return(1);`
-		29	`}`
-		30	`return(0);`
-		31	`}`
-		32
24	`#include "cmd/_notimpl.c"`	33	`#include "cmd/_notimpl.c"`
25	`#include "cmd/cd.c"`	34	`#include "cmd/cd.c"`
26	`#include "cmd/dir.c"`	35	`#include "cmd/dir.c"`
27	`#include "cmd/exit.c"`	36	`#include "cmd/exit.c"`
28	`#include "cmd/mkdir.c"`	37	`#include "cmd/mkdir.c"`
29	`#include "cmd/path.c"`	38	`#include "cmd/path.c"`
30	`#include "cmd/prompt.c"`	39	`#include "cmd/prompt.c"`
31	`#include "cmd/rmdir.c"`	40	`#include "cmd/rmdir.c"`
32	`#include "cmd/set.c"`	41	`#include "cmd/set.c"`
33	`#include "cmd/ver.c"`	42	`#include "cmd/ver.c"`
34	`#include "cmd/verify.c"`	43	`#include "cmd/verify.c"`
35	`#include "cmd/type.c"`	44	`#include "cmd/type.c"`
36		45
37	`#include "cmd.h"`	46	`#include "cmd.h"`
38		47
39		48
40	`struct CMD_ID {`	49	`struct CMD_ID {`
41	`const char *cmd;`	50	`const char *cmd;`
42	`int (func_ptr)(struct cmd_funcparam ); /* pointer to handling function */`	51	`int (func_ptr)(struct cmd_funcparam ); /* pointer to handling function */`
43	`};`	52	`};`
44		53
45	`const struct CMD_ID INTERNAL_CMDS[] = {`	54	`const struct CMD_ID INTERNAL_CMDS[] = {`
46	`{"BREAK", cmd_notimpl},`	55	`{"BREAK", cmd_notimpl},`
47	`{"CD", cmd_cd},`	56	`{"CD", cmd_cd},`
48	`{"CHCP", cmd_notimpl},`	57	`{"CHCP", cmd_notimpl},`
49	`{"CHDIR", cmd_cd},`	58	`{"CHDIR", cmd_cd},`
50	`{"CLS", cmd_notimpl},`	59	`{"CLS", cmd_notimpl},`
51	`{"COPY", cmd_notimpl},`	60	`{"COPY", cmd_notimpl},`
52	`{"CTTY", cmd_notimpl},`	61	`{"CTTY", cmd_notimpl},`
53	`{"DATE", cmd_notimpl},`	62	`{"DATE", cmd_notimpl},`
54	`{"DEL", cmd_notimpl},`	63	`{"DEL", cmd_notimpl},`
55	`{"DIR", cmd_dir},`	64	`{"DIR", cmd_dir},`
56	`{"ECHO", cmd_notimpl},`	65	`{"ECHO", cmd_notimpl},`
57	`{"ERASE", cmd_notimpl},`	66	`{"ERASE", cmd_notimpl},`
58	`{"EXIT", cmd_exit},`	67	`{"EXIT", cmd_exit},`
59	`{"LH", cmd_notimpl},`	68	`{"LH", cmd_notimpl},`
60	`{"LOADHIGH",cmd_notimpl},`	69	`{"LOADHIGH",cmd_notimpl},`
61	`{"MD", cmd_mkdir},`	70	`{"MD", cmd_mkdir},`
62	`{"MKDIR", cmd_mkdir},`	71	`{"MKDIR", cmd_mkdir},`
63	`{"PAUSE", cmd_notimpl},`	72	`{"PAUSE", cmd_notimpl},`
64	`{"PATH", cmd_path},`	73	`{"PATH", cmd_path},`
65	`{"PROMPT", cmd_prompt},`	74	`{"PROMPT", cmd_prompt},`
66	`{"RD", cmd_rmdir},`	75	`{"RD", cmd_rmdir},`
67	`{"REN", cmd_notimpl},`	76	`{"REN", cmd_notimpl},`
68	`{"RENAME", cmd_notimpl},`	77	`{"RENAME", cmd_notimpl},`
69	`{"RMDIR", cmd_rmdir},`	78	`{"RMDIR", cmd_rmdir},`
70	`{"SET", cmd_set},`	79	`{"SET", cmd_set},`
71	`{"TIME", cmd_notimpl},`	80	`{"TIME", cmd_notimpl},`
72	`{"TYPE", cmd_type},`	81	`{"TYPE", cmd_type},`
73	`{"VER", cmd_ver},`	82	`{"VER", cmd_ver},`
74	`{"VERIFY", cmd_verify},`	83	`{"VERIFY", cmd_verify},`
75	`{"VOL", cmd_notimpl},`	84	`{"VOL", cmd_notimpl},`
76	`{NULL, NULL}`	85	`{NULL, NULL}`
77	`};`	86	`};`
78		87
79		88
80	`/* NULL if cmdline is not matching an internal command, otherwise returns a`	89	`/* NULL if cmdline is not matching an internal command, otherwise returns a`
81	`* pointer to a CMD_ID struct */`	90	`* pointer to a CMD_ID struct */`
82	`static const struct CMD_ID cmd_match(const char far cmdline, unsigned short *argoffset) {`	91	`static const struct CMD_ID cmd_match(const char far cmdline, unsigned short *argoffset) {`
83	`unsigned short i;`	92	`unsigned short i;`
84	`char buff[10];`	93	`char buff[10];`
85		94
86	`/* copy command to buffer, until space, NULL, tab, return, dot, slash or backslash */`	95	`/* copy command to buffer, until space, NULL, tab, return, dot, slash or backslash */`
87	`for (i = 0; i < 9; i++) {`	96	`for (i = 0; i < 9; i++) {`
88	`if (cmdline[i] == ' ') break;`	97	`if (cmdline[i] == ' ') break;`
89	`if (cmdline[i] == 0) break;`	98	`if (cmdline[i] == 0) break;`
90	`if (cmdline[i] == '\t') break;`	99	`if (cmdline[i] == '\t') break;`
91	`if (cmdline[i] == '\r') break;`	100	`if (cmdline[i] == '\r') break;`
92	`if (cmdline[i] == '.') break;`	101	`if (cmdline[i] == '.') break;`
93	`if (cmdline[i] == '/') break;`	102	`if (cmdline[i] == '/') break;`
94	`if (cmdline[i] == '\\') break;`	103	`if (cmdline[i] == '\\') break;`
95	`buff[i] = cmdline[i];`	104	`buff[i] = cmdline[i];`
96	`}`	105	`}`
97	`buff[i] = 0;`	106	`buff[i] = 0;`
98		107
99	`/* advance to nearest non-space to find where arguments start */`	108	`/* advance to nearest non-space to find where arguments start */`
100	`while (cmdline[i] == ' ') i++;`	109	`while (cmdline[i] == ' ') i++;`
101	`*argoffset = i;`	110	`*argoffset = i;`
102		111
103	`/* try matching an internal command */`	112	`/* try matching an internal command */`
104	`for (i = 0; INTERNAL_CMDS[i].cmd != NULL; i++) {`	113	`for (i = 0; INTERNAL_CMDS[i].cmd != NULL; i++) {`
105	`/printf("imatch(%s,%s)\r\n", buff, INTERNAL_CMDS[i].cmd); /`	114	`/printf("imatch(%s,%s)\r\n", buff, INTERNAL_CMDS[i].cmd); /`
106	`if (imatch(buff, INTERNAL_CMDS[i].cmd)) {`	115	`if (imatch(buff, INTERNAL_CMDS[i].cmd)) {`
107	`/printf("match cmd i=%u (buff=%s)\r\n", i, buff);/`	116	`/printf("match cmd i=%u (buff=%s)\r\n", i, buff);/`
108	`return(&(INTERNAL_CMDS[i]));`	117	`return(&(INTERNAL_CMDS[i]));`
109	`}`	118	`}`
110	`}`	119	`}`
111		120
112	`return(NULL); /* command is not recognized as internal */`	121	`return(NULL); /* command is not recognized as internal */`
113	`}`	122	`}`
114		123
115		124
116	`/* explodes a command into an array of arguments where last arg is NULL`	125	`/* explodes a command into an array of arguments where last arg is NULL`
117	`* returns number of args */`	126	`* returns number of args */`
118	`unsigned short cmd_explode(char buff, const char far s, char const **argvlist) {`	127	`unsigned short cmd_explode(char buff, const char far s, char const **argvlist) {`
119	`int si = 0, argc = 0, i = 0;`	128	`int si = 0, argc = 0, i = 0;`
120	`for (;;) {`	129	`for (;;) {`
121	`/* skip to next non-space character */`	130	`/* skip to next non-space character */`
122	`while (s[si] == ' ') si++;`	131	`while (s[si] == ' ') si++;`
123	`/* end of string? */`	132	`/* end of string? */`
124	`if (s[si] == 0) break;`	133	`if (s[si] == 0) break;`
125	`/* set argv ptr */`	134	`/* set argv ptr */`
126	`argvlist[argc++] = buff + i;`	135	`argvlist[argc++] = buff + i;`
127	`/* find next space while copying arg to local buffer */`	136	`/* find next space while copying arg to local buffer */`
128	`do {`	137	`do {`
129	`buff[i++] = s[si++];`	138	`buff[i++] = s[si++];`
130	`} while (s[si] != ' ' && s[si] != 0 && s[si] != '/');`	139	`} while (s[si] != ' ' && s[si] != 0 && s[si] != '/');`
131	`buff[i++] = 0;`	140	`buff[i++] = 0;`
132	`/* is this end of string? */`	141	`/* is this end of string? */`
133	`if (s[si] == 0) break;`	142	`if (s[si] == 0) break;`
134	`}`	143	`}`
135	`argvlist[argc] = NULL;`	144	`argvlist[argc] = NULL;`
136	`return(argc);`	145	`return(argc);`
137	`}`	146	`}`
138		147
139		148
140	`int cmd_process(unsigned short env_seg, const char far cmdline, char BUFFER) {`	149	`int cmd_process(unsigned short env_seg, const char far cmdline, char BUFFER) {`
141	`const struct CMD_ID *cmdptr;`	150	`const struct CMD_ID *cmdptr;`
142	`unsigned short argoffset;`	151	`unsigned short argoffset;`
143	`struct cmd_funcparam p = (void )BUFFER;`	152	`struct cmd_funcparam p = (void )BUFFER;`
144		153
145	`/* special case: is this a drive change? (like "E:") */`	154	`/* special case: is this a drive change? (like "E:") */`
146	`if ((cmdline[0] != 0) && (cmdline[1] == ':') && ((cmdline[2] == ' ') \|\| (cmdline[2] == 0))) {`	155	`if ((cmdline[0] != 0) && (cmdline[1] == ':') && ((cmdline[2] == ' ') \|\| (cmdline[2] == 0))) {`
147	`if (((cmdline[0] >= 'a') && (cmdline[0] <= 'z')) \|\| ((cmdline[0] >= 'A') && (cmdline[0] <= 'Z'))) {`	156	`if (((cmdline[0] >= 'a') && (cmdline[0] <= 'z')) \|\| ((cmdline[0] >= 'A') && (cmdline[0] <= 'Z'))) {`
148	`unsigned char drive = cmdline[0];`	157	`unsigned char drive = cmdline[0];`
149	`unsigned char curdrive = 0;`	158	`unsigned char curdrive = 0;`
150	`if (drive >= 'a') {`	159	`if (drive >= 'a') {`
151	`drive -= 'a';`	160	`drive -= 'a';`
152	`} else {`	161	`} else {`
153	`drive -= 'A';`	162	`drive -= 'A';`
154	`}`	163	`}`
155	`_asm {`	164	`_asm {`
156	`push ax`	165	`push ax`
157	`push dx`	166	`push dx`
158	`mov ah, 0x0e /* DOS 1+ - SELECT DEFAULT DRIVE */`	167	`mov ah, 0x0e /* DOS 1+ - SELECT DEFAULT DRIVE */`
159	`mov dl, drive /* DL = new default drive (00h = A:, 01h = B:, etc) */`	168	`mov dl, drive /* DL = new default drive (00h = A:, 01h = B:, etc) */`
160	`int 0x21`	169	`int 0x21`
161	`mov ah, 0x19 /* DOS 1+ - GET CURRENT DRIVE */`	170	`mov ah, 0x19 /* DOS 1+ - GET CURRENT DRIVE */`
162	`int 0x21`	171	`int 0x21`
163	`mov curdrive, al /* cur drive (0=A, 1=B, etc) */`	172	`mov curdrive, al /* cur drive (0=A, 1=B, etc) */`
164	`pop dx`	173	`pop dx`
165	`pop ax`	174	`pop ax`
166	`}`	175	`}`
167	`if (curdrive != drive) puts(doserr(0x0f));`	176	`if (curdrive != drive) puts(doserr(0x0f));`
168	`return(-1);`	177	`return(-1);`
169	`}`	178	`}`
170	`}`	179	`}`
171		180
172	`/* try matching an internal command */`	181	`/* try matching an internal command */`
173	`cmdptr = cmd_match(cmdline, &argoffset);`	182	`cmdptr = cmd_match(cmdline, &argoffset);`
174	`if (cmdptr == NULL) return(-2); /* command is not recognized as internal */`	183	`if (cmdptr == NULL) return(-2); /* command is not recognized as internal */`
175		184
176	`/* printf("recognized internal command: '%s', tail of command at offset %u\r\n", cmdptr->cmd, argoffset); */`	185	`/* printf("recognized internal command: '%s', tail of command at offset %u\r\n", cmdptr->cmd, argoffset); */`
177		186
178	`/* prepare function parameters and feed it to the cmd handling function */`	187	`/* prepare function parameters and feed it to the cmd handling function */`
179	`p->argc = cmd_explode(BUFFER + sizeof(*p), cmdline + argoffset, p->argv);`	188	`p->argc = cmd_explode(BUFFER + sizeof(*p), cmdline + argoffset, p->argv);`
180	`p->env_seg = env_seg;`	189	`p->env_seg = env_seg;`
181	`p->argoffset = argoffset;`	190	`p->argoffset = argoffset;`
182	`p->cmdline = cmdline;`	191	`p->cmdline = cmdline;`
183		192
184	`return((cmdptr->func_ptr)(p));`	193	`return((cmdptr->func_ptr)(p));`
185	`}`	194	`}`
186		195

Subversion Repositories SvarDOS

(root)/svarcom/trunk/cmd.c @ 576 – Rev 386 → 387