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[lib/c] Add gets() and fgets()

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

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

@@ -11,6 +11,7 @@

       isxdigit.o toupper.o tolower.o ctype.o setlocale.o \

       localeconv.o atoi.o atol.o atoll.o atexit.o exit.o \

       printf.o fprintf.o vfprintf.o \

+      fgets.o gets.o \

       realloc.o calloc.o malloc.o

 all: $(ARCH)-libc.a

--- /dev/null

+++ b/lib/c/src/fgets.c

@@ -1,0 +1,19 @@

+#include <stdio.h>

+#undef fgets

+

+char *

+fgets(char *s, int n, FILE *fp)

+{

+	int ch;

+	char *t = s;

+

+	while (--n > 0 && (ch = getc(fp)) != EOF) {

+		if ((*t++ = ch) == '\n')

+			break;

+	}

+	if (ch == EOF && s == t)

+		return NULL;

+	*t = '\0';

+

+	return s;

+}

--- /dev/null

+++ b/lib/c/src/gets.c

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

+#include <stdio.h>

+#undef gets

+

+char *

+gets(char *s)

+{

+	int ch;

+	char *t = s;

+

+	while ((ch = getc(stdin)) != EOF && ch != '\n')

+		*t++ = ch;

+	if (ch == EOF && s == t)

+		return NULL;

+	*t = '\0';

+

+	return s;

+}