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common/utils: simple utf8 helpers.

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Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2020-11-25 10:39:08 +10:30
parent 7bfb5f10c7
commit f1bea50e1d
2 changed files with 43 additions and 0 deletions
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37
common/utils.c
View File

@ -3,6 +3,8 @@
#include <ccan/list/list.h>
#include <ccan/str/hex/hex.h>
#include <ccan/tal/str/str.h>
#include <ccan/utf8/utf8.h>
#include <errno.h>
#include <locale.h>
const tal_t *wally_tal_ctx;
@ -173,3 +175,38 @@ void *tal_dup_talarr_(const tal_t *ctx, const tal_t *src TAKES, const char *labe
}
return tal_dup_(ctx, src, 1, tal_bytelen(src), 0, label);
}
/* Check for valid UTF-8 */
bool utf8_check(const void *vbuf, size_t buflen)
{
const u8 *buf = vbuf;
struct utf8_state utf8_state = UTF8_STATE_INIT;
bool need_more = false;
for (size_t i = 0; i < buflen; i++) {
if (!utf8_decode(&utf8_state, buf[i])) {
need_more = true;
continue;
}
need_more = false;
if (errno != 0)
return false;
}
return !need_more;
}
char *utf8_str(const tal_t *ctx, const u8 *buf TAKES, size_t buflen)
{
char *ret;
if (!utf8_check(buf, buflen)) {
if (taken(buf))
tal_free(buf);
return NULL;
}
/* Add one for nul term */
ret = tal_dup_arr(ctx, char, (const char *)buf, buflen, 1);
ret[buflen] = '\0';
return ret;
}

6
common/utils.h
View File

@ -72,6 +72,12 @@ void tal_arr_remove_(void *p, size_t elemsize, size_t n);
void *tal_dup_talarr_(const tal_t *ctx, const tal_t *src TAKES,
const char *label);
/* Check for valid UTF-8 */
bool utf8_check(const void *buf, size_t buflen);
/* Check it's UTF-8, return copy (or same if TAKES), or NULL if not valid. */
char *utf8_str(const tal_t *ctx, const u8 *buf TAKES, size_t buflen);
/* Use the POSIX C locale. */
void setup_locale(void);