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libbb: add is_suffixed_with() function

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Signed-off-by: Bartosz Golaszewski <bartekgola@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Bartosz Golaszewski 2015-08-25 16:36:43 +02:00 committed by Denys Vlasenko
parent 5b865deb3f
commit 7448b513c8
2 changed files with 34 additions and 0 deletions
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1
include/libbb.h
View File

@ -413,6 +413,7 @@ const char *bb_basename(const char *name) FAST_FUNC;
char *last_char_is(const char *s, int c) FAST_FUNC;
const char* endofname(const char *name) FAST_FUNC;
char *is_prefixed_with(const char *string, const char *key) FAST_FUNC;
char *is_suffixed_with(const char *string, const char *key) FAST_FUNC;
int ndelay_on(int fd) FAST_FUNC;
int ndelay_off(int fd) FAST_FUNC;

33
libbb/compare_string_array.c
View File

@ -28,6 +28,25 @@ char* FAST_FUNC is_prefixed_with(const char *string, const char *key)
#endif
}
/*
* Return NULL if string is not suffixed with key. Return pointer to the
* beginning of prefix key in string. If key is an empty string return pointer
* to the end of string.
*/
char* FAST_FUNC is_suffixed_with(const char *string, const char *key)
{
size_t key_len = strlen(key);
ssize_t len_diff = strlen(string) - key_len;
if (len_diff >= 0) {
if (strcmp(string + len_diff, key) == 0) {
return (char*)key;
}
}
return NULL;
}
/* 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)
@ -133,4 +152,18 @@ BBUNIT_DEFINE_TEST(is_prefixed_with)
BBUNIT_ENDTEST;
}
BBUNIT_DEFINE_TEST(is_suffixed_with)
{
BBUNIT_ASSERT_STREQ("bar", is_suffixed_with("foo bar", "bar"));
BBUNIT_ASSERT_STREQ("foo", is_suffixed_with("foo", "foo"));
BBUNIT_ASSERT_STREQ("", is_suffixed_with("foo", ""));
BBUNIT_ASSERT_STREQ("", is_suffixed_with("", ""));
BBUNIT_ASSERT_NULL(is_suffixed_with("foo", "bar foo"));
BBUNIT_ASSERT_NULL(is_suffixed_with("foo foo", "bar"));
BBUNIT_ASSERT_NULL(is_suffixed_with("", "foo"));
BBUNIT_ENDTEST;
}
#endif /* ENABLE_UNIT_TEST */