busybox/libbb/compare_string_array.c

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

#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
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) */
10	int 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
22	int 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
39	int 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
54	int 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
76	const 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. */
87	smallint 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