shithub: riscv

Info  •  Files  •  Log  •  Branches

libap: add strndup

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.

--- a/sys/include/ape/string.h

+++ b/sys/include/ape/string.h

@@ -19,6 +19,7 @@

 extern int strcmp(const char *, const char *);

 extern int strcoll(const char *, const char *);

 extern char *strdup(char*);

+extern char *strndup(char*, size_t);

 extern int strncmp(const char *, const char *, size_t);

 extern size_t strxfrm(char *, const char *, size_t);

 extern void *memchr(const void *, int, size_t);

--- /dev/null

+++ b/sys/src/ape/lib/ap/gen/strndup.c

@@ -1,0 +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;

+}