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basic: add string_contains_word()

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This wraps the common pattern of using extract_first_word() in a loop
to look for a matching word.
This commit is contained in:
Zbigniew Jędrzejewski-Szmek 2020-07-29 14:06:26 +02:00
parent 0176728a73
commit 53cd7f3374
3 changed files with 75 additions and 0 deletions
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20
src/basic/string-util.c
View File

@ -8,6 +8,7 @@
#include "alloc-util.h"
#include "escape.h"
#include "extract-word.h"
#include "fileio.h"
#include "gunicode.h"
#include "locale-util.h"
@ -1207,3 +1208,22 @@ int string_extract_line(const char *s, size_t i, char **ret) {
c++;
}
}
int string_contains_word(const char *string, const char *separators, const char *word) {
/* In the default mode with no separators specified, we split on whitespace and
* don't coalesce separators. */
const ExtractFlags flags = separators ? EXTRACT_DONT_COALESCE_SEPARATORS : 0;
for (const char *p = string;;) {
_cleanup_free_ char *w = NULL;
int r;
r = extract_first_word(&p, &w, separators, flags);
if (r < 0)
return r;
if (r == 0)
return false;
if (streq(w, word))
return true;
}
}

1
src/basic/string-util.h
View File

@ -280,3 +280,4 @@ char* string_erase(char *x);
int string_truncate_lines(const char *s, size_t n_lines, char **ret);
int string_extract_line(const char *s, size_t i, char **ret);
int string_contains_word(const char *string, const char *separators, const char *word);

54
src/test/test-string-util.c
View File

@ -796,6 +796,59 @@ static void test_string_extract_line(void) {
test_string_extract_lines_one("\n\n\nx\n", 3, "x", false);
}
static void test_string_contains_word(void) {
log_info("/* %s */", __func__);
assert_se( string_contains_word("a b cc", NULL, "a"));
assert_se( string_contains_word("a b cc", NULL, "b"));
assert_se(!string_contains_word("a b cc", NULL, "c"));
assert_se( string_contains_word("a b cc", NULL, "cc"));
assert_se(!string_contains_word("a b cc", NULL, "d"));
assert_se(!string_contains_word("a b cc", NULL, "a b"));
assert_se(!string_contains_word("a b cc", NULL, "a b c"));
assert_se(!string_contains_word("a b cc", NULL, "b c"));
assert_se(!string_contains_word("a b cc", NULL, "b cc"));
assert_se(!string_contains_word("a b cc", NULL, "a "));
assert_se(!string_contains_word("a b cc", NULL, " b "));
assert_se(!string_contains_word("a b cc", NULL, " cc"));
assert_se( string_contains_word(" a b\t\tcc", NULL, "a"));
assert_se( string_contains_word(" a b\t\tcc", NULL, "b"));
assert_se(!string_contains_word(" a b\t\tcc", NULL, "c"));
assert_se( string_contains_word(" a b\t\tcc", NULL, "cc"));
assert_se(!string_contains_word(" a b\t\tcc", NULL, "d"));
assert_se(!string_contains_word(" a b\t\tcc", NULL, "a b"));
assert_se(!string_contains_word(" a b\t\tcc", NULL, "a b\t\tc"));
assert_se(!string_contains_word(" a b\t\tcc", NULL, "b\t\tc"));
assert_se(!string_contains_word(" a b\t\tcc", NULL, "b\t\tcc"));
assert_se(!string_contains_word(" a b\t\tcc", NULL, "a "));
assert_se(!string_contains_word(" a b\t\tcc", NULL, " b "));
assert_se(!string_contains_word(" a b\t\tcc", NULL, " cc"));
assert_se(!string_contains_word(" a b\t\tcc", NULL, ""));
assert_se(!string_contains_word(" a b\t\tcc", NULL, " "));
assert_se(!string_contains_word(" a b\t\tcc", NULL, " "));
assert_se( string_contains_word(" a b\t\tcc", " ", ""));
assert_se( string_contains_word(" a b\t\tcc", "\t", ""));
assert_se( string_contains_word(" a b\t\tcc", WHITESPACE, ""));
assert_se( string_contains_word("a:b:cc", ":#", "a"));
assert_se( string_contains_word("a:b:cc", ":#", "b"));
assert_se(!string_contains_word("a:b:cc", ":#", "c"));
assert_se( string_contains_word("a:b:cc", ":#", "cc"));
assert_se(!string_contains_word("a:b:cc", ":#", "d"));
assert_se(!string_contains_word("a:b:cc", ":#", "a:b"));
assert_se(!string_contains_word("a:b:cc", ":#", "a:b:c"));
assert_se(!string_contains_word("a:b:cc", ":#", "b:c"));
assert_se(!string_contains_word("a#b#cc", ":#", "b:cc"));
assert_se( string_contains_word("a#b#cc", ":#", "b"));
assert_se( string_contains_word("a#b#cc", ":#", "cc"));
assert_se(!string_contains_word("a:b:cc", ":#", "a:"));
assert_se(!string_contains_word("a:b cc", ":#", "b"));
assert_se( string_contains_word("a:b cc", ":#", "b cc"));
assert_se(!string_contains_word("a:b:cc", ":#", ":cc"));
}
int main(int argc, char *argv[]) {
test_setup_logging(LOG_DEBUG);
@ -831,6 +884,7 @@ int main(int argc, char *argv[]) {
test_memory_startswith_no_case();
test_string_truncate_lines();
test_string_extract_line();
test_string_contains_word();
return 0;
}