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utils: add strstartswith() and strendswith() utility functions

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Modeled after Python's str.startswith() and str.endswith()

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
This commit is contained in:
Peter Hutterer 2020-06-17 08:58:44 +10:00
parent 84b3b1731a
commit bd1fcb9c6e
2 changed files with 76 additions and 0 deletions
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26
src/util-strings.h
View file

@ -338,3 +338,29 @@ strstrip(const char *input, const char *what)
return str;
}
/**
* Return true if str ends in suffix, false otherwise. If the suffix is the
* empty string, strendswith() always returns false.
*/
static inline bool
strendswith(const char *str, const char *suffix)
{
size_t slen = strlen(str);
size_t suffixlen = strlen(suffix);
size_t offset;
if (slen == 0 || suffixlen == 0 || suffixlen > slen)
return false;
offset = slen - suffixlen;
return strneq(&str[offset], suffix, suffixlen);
}
static inline bool
strstartswith(const char *str, const char *prefix)
{
size_t prefixlen = strlen(prefix);
return prefixlen > 0 ? strneq(str, prefix, strlen(prefix)) : false;
}

50
test/test-utils.c
View file

@ -1102,6 +1102,54 @@ START_TEST(strstrip_test)
}
END_TEST
START_TEST(strendswith_test)
{
struct strendswith_test {
const char *string;
const char *suffix;
bool expected;
} tests[] = {
{ "foobar", "bar", true },
{ "foobar", "foo", false },
{ "foobar", "foobar", true },
{ "foo", "foobar", false },
{ "foobar", "", false },
{ "", "", false },
{ "", "foo", false },
{ NULL, NULL, false },
};
for (struct strendswith_test *t = tests; t->string; t++) {
ck_assert_int_eq(strendswith(t->string, t->suffix),
t->expected);
}
}
END_TEST
START_TEST(strstartswith_test)
{
struct strstartswith_test {
const char *string;
const char *suffix;
bool expected;
} tests[] = {
{ "foobar", "foo", true },
{ "foobar", "bar", false },
{ "foobar", "foobar", true },
{ "foo", "foobar", false },
{ "foo", "", false },
{ "", "", false },
{ "foo", "", false },
{ NULL, NULL, false },
};
for (struct strstartswith_test *t = tests; t->string; t++) {
ck_assert_int_eq(strstartswith(t->string, t->suffix),
t->expected);
}
}
END_TEST
START_TEST(list_test_insert)
{
struct list_test {
@ -1208,6 +1256,8 @@ litest_utils_suite(void)
tcase_add_test(tc, kvsplit_double_test);
tcase_add_test(tc, strjoin_test);
tcase_add_test(tc, strstrip_test);
tcase_add_test(tc, strendswith_test);
tcase_add_test(tc, strstartswith_test);
tcase_add_test(tc, time_conversion);
tcase_add_test(tc, human_time);