| 219 |
mateuszvis |
1 |
/* This file provides functions for parsing commands and their arguments
|
|
|
2 |
|
|
|
3 |
Warning: parsecmd() will modify the cmdline string, so it won't be
|
|
|
4 |
readable anymore in any other way other than via ptrtable[].
|
|
|
5 |
This function returns the number of arguments that have been parsed,
|
|
|
6 |
or -1 on parsing error.
|
|
|
7 |
|
|
|
8 |
Copyright (C) 2012-2016 Mateusz Viste */
|
|
|
9 |
|
|
|
10 |
#include "version.h"
|
|
|
11 |
|
|
|
12 |
int parsecmd(char *cmdline, char **ptrtable, int maxargs) {
|
|
|
13 |
int x = 0, argc = 0, state = 0;
|
|
|
14 |
for (;;) {
|
|
|
15 |
switch (cmdline[x]) { /* detect delimiter and non-delimiter chars */
|
|
|
16 |
case 0x0: /* detect end of string */
|
|
|
17 |
return(argc); /* return number of arguments */
|
|
|
18 |
case ' ': /* space */
|
|
|
19 |
case 0x9: /* tab */
|
|
|
20 |
case 0xA: /* LF */
|
|
|
21 |
case 0xD: /* CR */
|
|
|
22 |
if (state != 0) { /* if awaiting for argument end */
|
|
|
23 |
cmdline[x] = 0; /* terminate the substring */
|
|
|
24 |
state = 0; /* switch to 'waiting for argument end' state */
|
|
|
25 |
}
|
|
|
26 |
break;
|
|
|
27 |
default: /* anything that is not a delimiter */
|
|
|
28 |
if (state == 0) { /* if awaiting for argument start */
|
|
|
29 |
if (argc == maxargs) return(-1); /* look out for arg overflow */
|
|
|
30 |
ptrtable[argc] = &cmdline[x]; /* save the address of the substring */
|
|
|
31 |
argc += 1; /* increment the arguments count */
|
|
|
32 |
state = 1; /* switch to 'waiting for argument' state */
|
|
|
33 |
}
|
|
|
34 |
}
|
|
|
35 |
x += 1; /* move to the next character of cmdline */
|
|
|
36 |
}
|
|
|
37 |
}
|