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add a printf function to sbstring (about time)

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This commit is contained in:
Enno Rehling 2018-12-01 19:54:07 +01:00
parent 2766ed8de4
commit 5d99dc7014
3 changed files with 47 additions and 0 deletions
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20
src/util/strings.c
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@ -256,6 +256,26 @@ char *str_strdup(const char *s) {
#endif
}
void sbs_printf(struct sbstring *sbs, const char *format, ...)
{
size_t size = sbs->size - (sbs->end - sbs->begin);
if (size > 0) {
va_list argp;
va_start(argp, format);
int bytes = vsnprintf(sbs->end, size, format, argp);
if (bytes > 0) {
if ((size_t)bytes >= size) {
bytes = size - 1;
/* terminate truncated output */
sbs->end[bytes] = '\0';
}
sbs->end += bytes;
}
va_end(argp);
}
}
void sbs_init(struct sbstring *sbs, char *buffer, size_t size)
{
assert(sbs);

1
src/util/strings.h
View file

@ -48,6 +48,7 @@ extern "C" {
char *end;
} sbstring;
void sbs_printf(struct sbstring *sbs, const char *format, ...);
void sbs_init(struct sbstring *sbs, char *buffer, size_t size);
void sbs_adopt(struct sbstring *sbs, char *buffer, size_t size);
void sbs_strcat(struct sbstring *sbs, const char *str);

26
src/util/strings.test.c
View file

@ -234,6 +234,31 @@ static void test_sbs_substr(CuTest * tc)
CuAssertIntEquals(tc, 'A', buffer[9]);
}
static void test_sbs_printf(CuTest * tc)
{
char buffer[10];
sbstring sbs;
sbs_init(&sbs, buffer, sizeof(buffer));
sbs_printf(&sbs, "%s %d", "1234", 5678);
CuAssertStrEquals(tc, "1234 5678", buffer);
sbs_init(&sbs, buffer, sizeof(buffer));
sbs_printf(&sbs, "%s", "12345");
sbs_printf(&sbs, "%d", 6789);
CuAssertStrEquals(tc, "123456789", buffer);
sbs_init(&sbs, buffer, sizeof(buffer));
sbs_printf(&sbs, "%s", "1234567890");
CuAssertStrEquals(tc, "123456789", buffer);
sbs_init(&sbs, buffer, sizeof(buffer));
sbs_printf(&sbs, "%d", 123456789);
CuAssertStrEquals(tc, "123456789", buffer);
sbs_printf(&sbs, "%s", "Hodor");
CuAssertStrEquals(tc, "123456789", buffer);
}
CuSuite *get_strings_suite(void)
{
CuSuite *suite = CuSuiteNew();
@ -249,5 +274,6 @@ CuSuite *get_strings_suite(void)
SUITE_ADD_TEST(suite, test_sbstring);
SUITE_ADD_TEST(suite, test_sbs_strcat);
SUITE_ADD_TEST(suite, test_sbs_substr);
SUITE_ADD_TEST(suite, test_sbs_printf);
return suite;
}