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libbb: add is_suffixed_with() function
Signed-off-by: Bartosz Golaszewski <bartekgola@gmail.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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@ -413,6 +413,7 @@ const char *bb_basename(const char *name) FAST_FUNC;
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char *last_char_is(const char *s, int c) FAST_FUNC;
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const char* endofname(const char *name) FAST_FUNC;
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char *is_prefixed_with(const char *string, const char *key) FAST_FUNC;
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char *is_suffixed_with(const char *string, const char *key) FAST_FUNC;
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int ndelay_on(int fd) FAST_FUNC;
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int ndelay_off(int fd) FAST_FUNC;
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@ -28,6 +28,25 @@ char* FAST_FUNC is_prefixed_with(const char *string, const char *key)
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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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if (strcmp(string + len_diff, key) == 0) {
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return (char*)key;
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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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@ -133,4 +152,18 @@ BBUNIT_DEFINE_TEST(is_prefixed_with)
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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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