1 /* ----------------------------------------------------------------------- *
2 *
3 * Copyright 2004-2009 H. Peter Anvin - All Rights Reserved
4 * Copyright 2009 Intel Corporation; author: H. Peter Anvin
5 *
6 * Permission is hereby granted, free of charge, to any person
7 * obtaining a copy of this software and associated documentation
8 * files (the "Software"), to deal in the Software without
9 * restriction, including without limitation the rights to use,
10 * copy, modify, merge, publish, distribute, sublicense, and/or
11 * sell copies of the Software, and to permit persons to whom
12 * the Software is furnished to do so, subject to the following
13 * conditions:
14 *
15 * The above copyright notice and this permission notice shall
16 * be included in all copies or substantial portions of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
19 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
20 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
21 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
22 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
23 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
24 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
25 * OTHER DEALINGS IN THE SOFTWARE.
26 *
27 * ----------------------------------------------------------------------- */
28
29 /*
30 * argv.c
31 *
32 * Parse a single C string into argc and argv (argc is return value.)
33 * memptr points to available memory.
34 */
35
36 #include <inttypes.h>
37 #include <stddef.h>
38 #include <stdio.h>
39 #include <syslinux/align.h>
40 #include <com32.h>
41
42 extern char _end[]; /* Symbol created by linker */
43 void *__mem_end = &_end; /* Global variable for use by malloc() */
44
__parse_argv(char *** argv,const char * str)45 int __parse_argv(char ***argv, const char *str)
46 {
47 char dummy_argv0[] = "";
48 char *mem = __mem_end;
49 const char *p = str;
50 char *q = mem;
51 char *r;
52 char **arg;
53 int wasspace = 1;
54 int argc = 1;
55
56 /* First copy the string, turning whitespace runs into nulls */
57 for (p = str;; p++) {
58 if (*p <= ' ') {
59 if (!wasspace) {
60 wasspace = 1;
61 *q++ = '\0';
62 }
63 } else {
64 if (wasspace) {
65 argc++;
66 wasspace = 0;
67 }
68 *q++ = *p;
69 }
70
71 /* This test is AFTER we have processed the null byte;
72 we treat it as a whitespace character so it terminates
73 the last argument */
74 if (!*p)
75 break;
76 }
77
78 /* Now create argv */
79 arg = (char **)ALIGN_UP_FOR(q, char *);
80 *argv = arg;
81 *arg++ = __com32.cs_name ? (char *)__com32.cs_name : dummy_argv0; /* argv[0] */
82
83 q--; /* Point q to final null */
84 if (mem < q)
85 *arg++ = mem; /* argv[1] */
86
87 for (r = mem; r < q; r++) {
88 if (*r == '\0') {
89 *arg++ = r + 1;
90 }
91 }
92
93 *arg++ = NULL; /* Null pointer at the end */
94 __mem_end = arg; /* End of memory we used */
95
96 return argc;
97 }
98