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