1/* vi: set sw=4 ts=4: */
2/*
3 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
4 */
5
6#include "libbb.h"
7
8/* returns the array index of the string */
9/* (index of first match is returned, or -1) */
10int FAST_FUNC index_in_str_array(const char *const string_array[], const char *key)
11{
12	int i;
13
14	for (i = 0; string_array[i] != 0; i++) {
15		if (strcmp(string_array[i], key) == 0) {
16			return i;
17		}
18	}
19	return -1;
20}
21
22int FAST_FUNC index_in_strings(const char *strings, const char *key)
23{
24	int idx = 0;
25
26	while (*strings) {
27		if (strcmp(strings, key) == 0) {
28			return idx;
29		}
30		strings += strlen(strings) + 1; /* skip NUL */
31		idx++;
32	}
33	return -1;
34}
35
36/* returns the array index of the string, even if it matches only a beginning */
37/* (index of first match is returned, or -1) */
38#ifdef UNUSED
39int FAST_FUNC index_in_substr_array(const char *const string_array[], const char *key)
40{
41	int i;
42	int len = strlen(key);
43	if (len) {
44		for (i = 0; string_array[i] != 0; i++) {
45			if (strncmp(string_array[i], key, len) == 0) {
46				return i;
47			}
48		}
49	}
50	return -1;
51}
52#endif
53
54int FAST_FUNC index_in_substrings(const char *strings, const char *key)
55{
56	int matched_idx = -1;
57	const int len = strlen(key);
58
59	if (len) {
60		int idx = 0;
61		while (*strings) {
62			if (strncmp(strings, key, len) == 0) {
63				if (strings[len] == '\0')
64					return idx; /* exact match */
65				if (matched_idx >= 0)
66					return -1; /* ambiguous match */
67				matched_idx = idx;
68			}
69			strings += strlen(strings) + 1; /* skip NUL */
70			idx++;
71		}
72	}
73	return matched_idx;
74}
75
76const char* FAST_FUNC nth_string(const char *strings, int n)
77{
78	while (n) {
79		n--;
80		strings += strlen(strings) + 1;
81	}
82	return strings;
83}
84
85#ifdef UNUSED_SO_FAR /* only brctl.c needs it yet */
86/* Returns 0 for no, 1 for yes or a negative value on error.  */
87smallint FAST_FUNC yesno(const char *str)
88{
89	static const char no_yes[] ALIGN1 =
90		"0\0" "off\0" "no\0"
91		"1\0" "on\0" "yes\0";
92	int ret = index_in_substrings(no_yes, str);
93	return ret / 3;
94}
95#endif
96