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pg_locale.c: Fix REL_18_STABLE for srclen < 0.

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Ensure that srclen >= 0 before calling strlower_c(), etc.

Commit 5f003855e7 backported strlower_c(), etc., to 18, but did not
account for the srclen < 0 behavior that existed in 18 (and was
removed later in version 19 with commit 6d22c67c3b).

No callers in core use the srclen < 0 behavior, but it's possible
(though unlikely) that extensions do.

This applies to REL_18_STABLE only.

Discussion: https://postgr.es/m/v36ssaygf7grb3qzfsjhtdzi7kqd45ds56nyuf7gi5qjml4qbb@ezmfqzmhlrs2
This commit is contained in:
Jeff Davis
2026-08-17 17:55:42 -07:00
parent 171f124947
commit 27e2afb492
1 changed files with 8 additions and 0 deletions
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8
src/backend/utils/adt/pg_locale.c
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@@ -1328,6 +1328,8 @@ size_t
pg_strlower(char *dst, size_t dstsize, const char *src, ssize_t srclen,
pg_locale_t locale)
{
srclen = (srclen < 0) ? strlen(src) : srclen;
if (locale->ctype_is_c)
return strlower_c(dst, dstsize, src, srclen);
else if (locale->provider == COLLPROVIDER_BUILTIN)
@@ -1349,6 +1351,8 @@ size_t
pg_strtitle(char *dst, size_t dstsize, const char *src, ssize_t srclen,
pg_locale_t locale)
{
srclen = (srclen < 0) ? strlen(src) : srclen;
if (locale->ctype_is_c)
return strtitle_c(dst, dstsize, src, srclen);
else if (locale->provider == COLLPROVIDER_BUILTIN)
@@ -1370,6 +1374,8 @@ size_t
pg_strupper(char *dst, size_t dstsize, const char *src, ssize_t srclen,
pg_locale_t locale)
{
srclen = (srclen < 0) ? strlen(src) : srclen;
if (locale->ctype_is_c)
return strupper_c(dst, dstsize, src, srclen);
else if (locale->provider == COLLPROVIDER_BUILTIN)
@@ -1391,6 +1397,8 @@ size_t
pg_strfold(char *dst, size_t dstsize, const char *src, ssize_t srclen,
pg_locale_t locale)
{
srclen = (srclen < 0) ? strlen(src) : srclen;
/* in the C locale, casefolding is the same as lowercasing */
if (locale->ctype_is_c)
return strlower_c(dst, dstsize, src, srclen);