171 lines
4.0 KiB
C
171 lines
4.0 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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*/
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#include "libbb.h"
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/*
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* Return NULL if string is not prefixed with key. Return pointer to the
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* first character in string after the prefix key. If key is an empty string,
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* return pointer to the beginning of string.
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*/
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char* FAST_FUNC is_prefixed_with(const char *string, const char *key)
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{
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#if 0 /* Two passes over key - probably slower */
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int len = strlen(key);
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if (strncmp(string, key, len) == 0)
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return string + len;
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return NULL;
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#else /* Open-coded */
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while (*key != '\0') {
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if (*key != *string)
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return NULL;
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key++;
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string++;
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}
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return (char*)string;
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#endif
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}
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/*
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* Return NULL if string is not suffixed with key. Return pointer to the
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* beginning of prefix key in string. If key is an empty string return pointer
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* to the end of string.
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*/
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char* FAST_FUNC is_suffixed_with(const char *string, const char *key)
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{
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size_t key_len = strlen(key);
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ssize_t len_diff = strlen(string) - key_len;
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if (len_diff >= 0) {
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string += len_diff;
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if (strcmp(string, key) == 0) {
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return (char*)string;
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}
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}
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return NULL;
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}
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/* returns the array index of the string */
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/* (index of first match is returned, or -1) */
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int FAST_FUNC index_in_str_array(const char *const string_array[], const char *key)
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{
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int i;
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for (i = 0; string_array[i] != 0; i++) {
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if (strcmp(string_array[i], key) == 0) {
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return i;
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}
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}
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return -1;
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}
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int FAST_FUNC index_in_strings(const char *strings, const char *key)
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{
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int idx = 0;
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while (*strings) {
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if (strcmp(strings, key) == 0) {
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return idx;
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}
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strings += strlen(strings) + 1; /* skip NUL */
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idx++;
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}
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return -1;
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}
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/* returns the array index of the string, even if it matches only a beginning */
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/* (index of first match is returned, or -1) */
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#ifdef UNUSED
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int FAST_FUNC index_in_substr_array(const char *const string_array[], const char *key)
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{
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int i;
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if (key[0]) {
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for (i = 0; string_array[i] != 0; i++) {
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if (is_prefixed_with(string_array[i], key)) {
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return i;
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}
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}
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}
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return -1;
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}
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#endif
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int FAST_FUNC index_in_substrings(const char *strings, const char *key)
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{
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int matched_idx = -1;
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const int len = strlen(key);
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if (len) {
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int idx = 0;
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while (*strings) {
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if (strncmp(strings, key, len) == 0) {
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if (strings[len] == '\0')
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return idx; /* exact match */
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if (matched_idx >= 0)
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return -1; /* ambiguous match */
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matched_idx = idx;
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}
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strings += strlen(strings) + 1; /* skip NUL */
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idx++;
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}
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}
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return matched_idx;
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}
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const char* FAST_FUNC nth_string(const char *strings, int n)
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{
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while (n) {
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n--;
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strings += strlen(strings) + 1;
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}
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return strings;
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}
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#ifdef UNUSED_SO_FAR /* only brctl.c needs it yet */
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/* Returns 0 for no, 1 for yes or a negative value on error. */
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smallint FAST_FUNC yesno(const char *str)
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{
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static const char no_yes[] ALIGN1 =
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"0\0" "off\0" "no\0"
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"1\0" "on\0" "yes\0";
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int ret = index_in_substrings(no_yes, str);
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return ret / 3;
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}
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#endif
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#if ENABLE_UNIT_TEST
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BBUNIT_DEFINE_TEST(is_prefixed_with)
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{
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BBUNIT_ASSERT_STREQ(" bar", is_prefixed_with("foo bar", "foo"));
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BBUNIT_ASSERT_STREQ("bar", is_prefixed_with("foo bar", "foo "));
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BBUNIT_ASSERT_STREQ("", is_prefixed_with("foo", "foo"));
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BBUNIT_ASSERT_STREQ("foo", is_prefixed_with("foo", ""));
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BBUNIT_ASSERT_STREQ("", is_prefixed_with("", ""));
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BBUNIT_ASSERT_NULL(is_prefixed_with("foo", "bar foo"));
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BBUNIT_ASSERT_NULL(is_prefixed_with("foo foo", "bar"));
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BBUNIT_ASSERT_NULL(is_prefixed_with("", "foo"));
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BBUNIT_ENDTEST;
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}
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BBUNIT_DEFINE_TEST(is_suffixed_with)
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{
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BBUNIT_ASSERT_STREQ("bar", is_suffixed_with("foo bar", "bar"));
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BBUNIT_ASSERT_STREQ("foo", is_suffixed_with("foo", "foo"));
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BBUNIT_ASSERT_STREQ("", is_suffixed_with("foo", ""));
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BBUNIT_ASSERT_STREQ("", is_suffixed_with("", ""));
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BBUNIT_ASSERT_NULL(is_suffixed_with("foo", "bar foo"));
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BBUNIT_ASSERT_NULL(is_suffixed_with("foo foo", "bar"));
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BBUNIT_ASSERT_NULL(is_suffixed_with("", "foo"));
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BBUNIT_ENDTEST;
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}
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#endif /* ENABLE_UNIT_TEST */
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