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[lib/c] Add tmpnam()

--- a/lib/c/src/Makefile

+++ b/lib/c/src/Makefile

@@ -5,6 +5,7 @@

 OBJ = bsearch.o qsort.o \

       abs.o __abs.o labs.o __labs.o llabs.o __labs.o \

       perror.o strerror.o \

+      tmpnam.o \

       sprintf.o snprintf.o vsprintf.o vsnprintf.o \

       printf.o fprintf.o vfprintf.o \

       fgets.o gets.of fgetc.o fputc.o getchar.o putchar.o \

--- a/lib/c/src/syscall.h

+++ b/lib/c/src/syscall.h

@@ -5,6 +5,10 @@

 extern int _write(int fd, void *buf, size_t n);

 extern int _lseek(int fd, long off, int whence);

 extern void _Exit(int status);

+extern void _access(char *path, int mode);

+

 extern int raise(int sig);

 extern void (*signal(int sig, void (*func)(int)))(int);

 extern getenv(const char *var);

+extern int rename(const char *from, const char *to);

+extern int remove(const char *path);

--- /dev/null

+++ b/lib/c/src/tmpnam.c

@@ -1,0 +1,32 @@

+

+#include <stdio.h>

+#include <string.h>

+#include "syscall.h"

+#undef tmpnam

+

+char *

+tmpnam(char *s)

+{

+	static char *tmpl, buf[L_tmpnam];

+	char *p;

+

+	if (*buf == '\0') {

+		for (tmpl = buf, p = _TMPNAME; *tmpl++ = *p++; )

+			;

+		for (p = tmpl; p < &buf[L_tmpnam-1]; ++p)

+			*p = '0';

+		*p = '\0';

+	}

+	for (;;) {

+		for (p = tmpl; *p && *p != '9'; ++p)

+			;

+		if (*p == '\0')

+			return NULL;

+		++*p;

+		if (_access(buf, 0) != 0)

+			break;

+	}

+	if (s)

+		strcpy(s, buf);

+	return buf;

+}