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json: add json_tok_endswith and json_tok_startswith helpers.

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I wanted this for offers, and it's generally useful.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell
2020-11-25 10:48:44 +10:30
parent 3408f8f998
commit d9586bbde1
3 changed files with 42 additions and 25 deletions
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22
common/json.c
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@@ -41,6 +41,28 @@ bool json_tok_streq(const char *buffer, const jsmntok_t *tok, const char *str)
return strncmp(buffer + tok->start, str, tok->end - tok->start) == 0;
}
bool json_tok_startswith(const char *buffer, const jsmntok_t *tok,
const char *prefix)
{
if (tok->type != JSMN_STRING)
return false;
if (tok->end - tok->start < strlen(prefix))
return false;
return memcmp(buffer + tok->start,
prefix, strlen(prefix)) == 0;
}
bool json_tok_endswith(const char *buffer, const jsmntok_t *tok,
const char *suffix)
{
if (tok->type != JSMN_STRING)
return false;
if (tok->end - tok->start < strlen(suffix))
return false;
return memcmp(buffer + tok->end - strlen(suffix),
suffix, strlen(suffix)) == 0;
}
char *json_strdup(const tal_t *ctx, const char *buffer, const jsmntok_t *tok)
{
return tal_strndup(ctx, buffer + tok->start, tok->end - tok->start);