source: MondoRescue/branches/3.0/mindi-busybox/libbb/compare_string_array.c@ 2899

/* vi: set sw=4 ts=4: */
/*
 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
 */

#include "libbb.h"

/* returns the array index of the string */
/* (index of first match is returned, or -1) */
int FAST_FUNC index_in_str_array(const char *const string_array[], const char *key)
{
    int i;

    for (i = 0; string_array[i] != 0; i++) {
        if (strcmp(string_array[i], key) == 0) {
            return i;
        }
    }
    return -1;
}

int FAST_FUNC index_in_strings(const char *strings, const char *key)
{
    int idx = 0;

    while (*strings) {
        if (strcmp(strings, key) == 0) {
            return idx;
        }
        strings += strlen(strings) + 1; /* skip NUL */
        idx++;
    }
    return -1;
}

/* returns the array index of the string, even if it matches only a beginning */
/* (index of first match is returned, or -1) */
#ifdef UNUSED
int FAST_FUNC index_in_substr_array(const char *const string_array[], const char *key)
{
    int i;
    int len = strlen(key);
    if (len) {
        for (i = 0; string_array[i] != 0; i++) {
            if (strncmp(string_array[i], key, len) == 0) {
                return i;
            }
        }
    }
    return -1;
}
#endif

int FAST_FUNC index_in_substrings(const char *strings, const char *key)
{
    int matched_idx = -1;
    const int len = strlen(key);

    if (len) {
        int idx = 0;
        while (*strings) {
            if (strncmp(strings, key, len) == 0) {
                if (strings[len] == '\0')
                    return idx; /* exact match */
                if (matched_idx >= 0)
                    return -1; /* ambiguous match */
                matched_idx = idx;
            }
            strings += strlen(strings) + 1; /* skip NUL */
            idx++;
        }
    }
    return matched_idx;
}

const char* FAST_FUNC nth_string(const char *strings, int n)
{
    while (n) {
        n--;
        strings += strlen(strings) + 1;
    }
    return strings;
}

#ifdef UNUSED_SO_FAR /* only brctl.c needs it yet */
/* Returns 0 for no, 1 for yes or a negative value on error.  */
smallint FAST_FUNC yesno(const char *str)
{
    static const char no_yes[] ALIGN1 =
        "0\0" "off\0" "no\0"
        "1\0" "on\0" "yes\0";
    int ret = index_in_substrings(no_yes, str);
    return ret / 3;
}
#endif