1 /*
2 *
3 * Copyright (C) 2008 coresystems GmbH
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. The name of the author may not be used to endorse or promote products
14 * derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 /**
30 * @file libc/readline.c
31 * Simple readline implementation
32 */
33
34 #include <libpayload.h>
35 #include <getopt.h>
36
37 /* We don't want to waste malloc on this, so we live with a small
38 * fixed size array
39 */
40 char *string_argv[MAX_ARGS];
41 int string_argc;
42
43 /**
44 * Take a string and make char *argv[] and int argc from it.
45 *
46 * This function allows the user to use getopt on an arbitrary string.
47 *
48 * global variables valid after a successful run of string_to_args():
49 * string_argc pointer to number of arguments
50 * string_argv pointer to argument list.
51 *
52 * @param caller to be used as argv[0] (may be NULL to ignore)
53 * @param string to process
54 * @return 0 if no error occurred.
55 */
string_to_args(char * caller,char * string)56 int string_to_args(char *caller, char *string)
57 {
58 int i = 0;
59
60 if (caller)
61 string_argv[i++] = caller;
62
63 if (*string)
64 string_argv[i++] = string;
65
66 /* Terminate if the string ends */
67 while (string && *string) {
68 /* whitespace occurred? */
69 if ((*string == ' ') || (*string == '\t')) {
70 /* skip all whitespace (and null it) */
71 while (*string == ' ' || *string == '\t')
72 *string++ = 0;
73 /* if our ugly static array is big enough, store
74 * argument to string_argv[]
75 */
76 if (i < MAX_ARGS)
77 string_argv[i++] = string;
78 }
79 string++;
80 }
81
82 /* prevent array from overflowing */
83 string_argc = (i <= MAX_ARGS) ? i : MAX_ARGS;
84
85 /* and return whether there was an overflow */
86 return (i <= MAX_ARGS) ? 0 : 1;
87 }
88