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libap: add strndup

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strndup is part of POSIX.1, so APE should provide it.
This patch adds it, so need to patch it out of fewer
programs going forward.
This commit is contained in:
Ori Bernstein 2020-12-17 19:20:04 -08:00
parent 646c502b15
commit 658c1b9f68
2 changed files with 21 additions and 0 deletions
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1
sys/include/ape/string.h
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@ -19,6 +19,7 @@ extern int memcmp(const void *, const void *, size_t);
extern int strcmp(const char *, const char *); extern int strcmp(const char *, const char *);
extern int strcoll(const char *, const char *); extern int strcoll(const char *, const char *);
extern char *strdup(char*); extern char *strdup(char*);
extern char *strndup(char*, size_t);
extern int strncmp(const char *, const char *, size_t); extern int strncmp(const char *, const char *, size_t);
extern size_t strxfrm(char *, const char *, size_t); extern size_t strxfrm(char *, const char *, size_t);
extern void *memchr(const void *, int, size_t); extern void *memchr(const void *, int, size_t);

20
sys/src/ape/lib/ap/gen/strndup.c Normal file
View file

@ -0,0 +1,20 @@
#include <string.h>
#include <ctype.h>
#include <stdlib.h>
char*
strndup(char *p, size_t max)
{
int n;
char *np;
n = strlen(p)+1;
if(n > max)
n = max+1;
np = malloc(n);
if(!np)
return nil;
memmove(np, p, n);
np[n-1] = 0;
return np;
}