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New helper function ptrlen_strcmp().

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Compares strings with the same semantics as strcmp, but uses ptrlens
as input instead of zero-terminated strings.
This commit is contained in:
Simon Tatham 2019-01-01 19:07:00 +00:00
parent c02031ffd6
commit d169b04dba
2 changed files with 12 additions and 0 deletions
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1
misc.h
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@ -157,6 +157,7 @@ static inline ptrlen ptrlen_from_strbuf(strbuf *sb)
bool ptrlen_eq_string(ptrlen pl, const char *str);
bool ptrlen_eq_ptrlen(ptrlen pl1, ptrlen pl2);
int ptrlen_strcmp(ptrlen pl1, ptrlen pl2);
bool ptrlen_startswith(ptrlen whole, ptrlen prefix, ptrlen *tail);
char *mkstr(ptrlen pl);
int string_length_for_printf(size_t);

11
utils.c
View File

@ -928,6 +928,17 @@ bool ptrlen_eq_ptrlen(ptrlen pl1, ptrlen pl2)
return (pl1.len == pl2.len && !memcmp(pl1.ptr, pl2.ptr, pl1.len));
}
int ptrlen_strcmp(ptrlen pl1, ptrlen pl2)
{
size_t minlen = pl1.len < pl2.len ? pl1.len : pl2.len;
if (minlen) { /* tolerate plX.ptr==NULL as long as plX.len==0 */
int cmp = memcmp(pl1.ptr, pl2.ptr, minlen);
if (cmp)
return cmp;
}
return pl1.len < pl2.len ? -1 : pl1.len > pl2.len ? +1 : 0;
}
bool ptrlen_startswith(ptrlen whole, ptrlen prefix, ptrlen *tail)
{
if (whole.len >= prefix.len &&