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[lib/c] Add perror() and strerror()

--- a/lib/c/include/errno.h

+++ b/lib/c/include/errno.h

@@ -8,5 +8,7 @@

 #define EBADF  5

 extern int errno;

+extern char *_sys_errlist[];

+extern int _sys_nerr;

 #endif

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

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

@@ -4,6 +4,7 @@

 OBJ = bsearch.o \

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

+      perror.o strerror.o \

       printf.o fprintf.o vfprintf.o \

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

       fputs.o puts.o fread.o fwrite.o \

--- /dev/null

+++ b/lib/c/src/perror.c

@@ -1,0 +1,17 @@

+

+#include <errno.h>

+#include <stdio.h>

+#include <string.h>

+#undef perror

+

+void

+perror(const char *msg)

+{

+	if (msg && *msg) {

+		fputs(msg, stderr);

+		putc(':', stderr);

+		putc(' ', stderr);

+	}

+	fputs(strerror(errno), stderr);

+	putc('\n', stderr);

+}

--- /dev/null

+++ b/lib/c/src/strerror.c

@@ -1,0 +1,13 @@

+

+#include <errno.h>

+#include <string.h>

+#undef strerror

+

+char *

+strerror(int errnum)

+{

+	if (errnum < _sys_nerr)

+		return _sys_errlist[errnum];

+	else

+		return "Unknown error";

+}