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libreboot-utils: optimised string functions

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operate per word, not per byte

this is also done on sdup, which uses a slightly
inefficient method: the new string allocation is
that of the maximum size, rather than what we
need. for example, if you wanted a 20 character
string (21 including null), you would still allocate
4096 bytes if that was the maximum length.

it's a bit naughty, and i have half a mind to
keep sdup on the old implementation, but i'll leave
it be for now.

Signed-off-by: Leah Rowe <leah@libreboot.org>
This commit is contained in:
Leah Rowe
2026-03-30 00:35:56 +01:00
parent 7fb0b2f692
commit 9d4302deb2
2 changed files with 191 additions and 50 deletions
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util/libreboot-utils/include/common.h
+4
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@@ -372,6 +372,8 @@ void write_mac_part(size_t partnum);
/* string functions
*/
size_t page_remain(const void *p);
long pagesize(void);
int xunveilx(const char *path, const char *permissions);
int xpledgex(const char *promises, const char *execpromises);
char *smalloc(char **buf, size_t size);
@@ -381,6 +383,8 @@ int slen(const char *scmp, size_t maxlen,
int vcmp(const void *s1, const void *s2, size_t n);
int scmp(const char *a, const char *b,
size_t maxlen, int *rval);
int ccmp(const char *a, const char *b, size_t i,
int *rval);
int sdup(const char *s,
size_t n, char **dest);
int scatn(ssize_t sc, const char **sv,