scrcpy/app/tests/test_strutil.c
Romain Vimont 0a7fe7ad57 Add helpers to truncate UTF-8 at code points
This will help to avoid truncating a UTF-8 string in the middle of a
code point, producing an invalid UTF-8 result.
2019-05-30 22:30:18 +02:00

172 lines
4.0 KiB
C

#include <assert.h>
#include <string.h>
#include "str_util.h"
static void test_xstrncpy_simple(void) {
char s[] = "xxxxxxxxxx";
size_t w = xstrncpy(s, "abcdef", sizeof(s));
// returns strlen of copied string
assert(w == 6);
// is nul-terminated
assert(s[6] == '\0');
// does not write useless bytes
assert(s[7] == 'x');
// copies the content as expected
assert(!strcmp("abcdef", s));
}
static void test_xstrncpy_just_fit(void) {
char s[] = "xxxxxx";
size_t w = xstrncpy(s, "abcdef", sizeof(s));
// returns strlen of copied string
assert(w == 6);
// is nul-terminated
assert(s[6] == '\0');
// copies the content as expected
assert(!strcmp("abcdef", s));
}
static void test_xstrncpy_truncated(void) {
char s[] = "xxx";
size_t w = xstrncpy(s, "abcdef", sizeof(s));
// returns 'n' (sizeof(s))
assert(w == 4);
// is nul-terminated
assert(s[3] == '\0');
// copies the content as expected
assert(!strncmp("abcdef", s, 3));
}
static void test_xstrjoin_simple(void) {
const char *const tokens[] = { "abc", "de", "fghi", NULL };
char s[] = "xxxxxxxxxxxxxx";
size_t w = xstrjoin(s, tokens, ' ', sizeof(s));
// returns strlen of concatenation
assert(w == 11);
// is nul-terminated
assert(s[11] == '\0');
// does not write useless bytes
assert(s[12] == 'x');
// copies the content as expected
assert(!strcmp("abc de fghi", s));
}
static void test_xstrjoin_just_fit(void) {
const char *const tokens[] = { "abc", "de", "fghi", NULL };
char s[] = "xxxxxxxxxxx";
size_t w = xstrjoin(s, tokens, ' ', sizeof(s));
// returns strlen of concatenation
assert(w == 11);
// is nul-terminated
assert(s[11] == '\0');
// copies the content as expected
assert(!strcmp("abc de fghi", s));
}
static void test_xstrjoin_truncated_in_token(void) {
const char *const tokens[] = { "abc", "de", "fghi", NULL };
char s[] = "xxxxx";
size_t w = xstrjoin(s, tokens, ' ', sizeof(s));
// returns 'n' (sizeof(s))
assert(w == 6);
// is nul-terminated
assert(s[5] == '\0');
// copies the content as expected
assert(!strcmp("abc d", s));
}
static void test_xstrjoin_truncated_before_sep(void) {
const char *const tokens[] = { "abc", "de", "fghi", NULL };
char s[] = "xxxxxx";
size_t w = xstrjoin(s, tokens, ' ', sizeof(s));
// returns 'n' (sizeof(s))
assert(w == 7);
// is nul-terminated
assert(s[6] == '\0');
// copies the content as expected
assert(!strcmp("abc de", s));
}
static void test_xstrjoin_truncated_after_sep(void) {
const char *const tokens[] = { "abc", "de", "fghi", NULL };
char s[] = "xxxxxxx";
size_t w = xstrjoin(s, tokens, ' ', sizeof(s));
// returns 'n' (sizeof(s))
assert(w == 8);
// is nul-terminated
assert(s[7] == '\0');
// copies the content as expected
assert(!strcmp("abc de ", s));
}
static void test_utf8_truncate(void) {
const char *s = "aÉbÔc";
assert(strlen(s) == 7); // É and Ô are 2 bytes-wide
size_t count;
count = utf8_truncation_index(s, 1);
assert(count == 1);
count = utf8_truncation_index(s, 2);
assert(count == 1); // É is 2 bytes-wide
count = utf8_truncation_index(s, 3);
assert(count == 3);
count = utf8_truncation_index(s, 4);
assert(count == 4);
count = utf8_truncation_index(s, 5);
assert(count == 4); // Ô is 2 bytes-wide
count = utf8_truncation_index(s, 6);
assert(count == 6);
count = utf8_truncation_index(s, 7);
assert(count == 7);
count = utf8_truncation_index(s, 8);
assert(count == 7); // no more chars
}
int main(void) {
test_xstrncpy_simple();
test_xstrncpy_just_fit();
test_xstrncpy_truncated();
test_xstrjoin_simple();
test_xstrjoin_just_fit();
test_xstrjoin_truncated_in_token();
test_xstrjoin_truncated_before_sep();
test_xstrjoin_truncated_after_sep();
test_utf8_truncate();
return 0;
}