1 files changed, 86 insertions, 0 deletions
diff --git a/8.2/stdio.c b/8.2/stdio.c
new file mode 100644
index 0000000..dd6cbef
--- /dev/null
+++ b/8.2/stdio.c
@@ -0,0 +1,86 @@
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include "stdio.h"
+
+#define PERMS	0666
+
+FILE _iob[OPN_MAX] = {
+	{0, (char *) NULL, (char *) NULL, {1, 0, 0, 1, 0, 0}, 0},
+	{0, (char *) NULL, (char *) NULL, {0, 1, 0, 1, 0, 0}, 1},
+	{0, (char *) NULL, (char *) NULL, {0, 1, 1, 0, 0, 0}, 2},
+};
+
+FILE *fopen(char *name, char *mode)
+{
+	int fd;
+	FILE *fp;
+
+	if (*mode != 'r' && *mode != 'w' && *mode != 'a')
+		return NULL;
+
+	for (fp = _iob; fp < _iob + OPN_MAX; ++fp)
+		if (fp->flag.is_read == 0 && fp->flag.is_write == 0)
+			break;
+	if (fp == _iob + OPN_MAX)
+		return NULL;
+
+	if (*mode == 'w') {
+		fd = creat(name, PERMS);
+	} else if (*mode == 'a') {
+		if ((fd = open(name, O_WRONLY)) == -1)
+			fd = creat(name, PERMS);
+		lseek(fd, 0L, 2);
+	} else {
+		fd = open(name, O_RDONLY);
+	}
+
+	if (fd == -1)
+		return NULL;
+
+	fp->fd = fd;
+	fp->cnt = 0;
+	fp->base = NULL;
+	fp->flag.is_unbuf = 0;
+	fp->flag.is_buf = 1;
+	fp->flag.is_eof = 0;
+	fp->flag.is_err = 0;
+	if (*mode == 'r') {
+		fp->flag.is_read = 1;
+		fp->flag.is_write = 0;
+	} else {
+		fp->flag.is_write = 1;
+		fp->flag.is_read = 0;
+	}
+
+	return fp;
+}
+
+int _fillbuf(FILE *fp)
+{
+	int bufsize;
+
+	if (fp->flag.is_read == 0 ||
+	    fp->flag.is_err  == 1 ||
+	    fp->flag.is_eof  == 1)
+		return EOF;
+
+	bufsize = (fp->flag.is_unbuf == 1) ? 1 : BUFSIZ;
+	if (fp->base == NULL)
+		if ((fp->base = (char *) malloc(bufsize)) == NULL)
+			return EOF;
+	fp->ptr = fp->base;
+	
+	fp->cnt = read(fp->fd, fp->base, bufsize);
+	if (--fp->cnt < 0) {
+		if (fp->cnt == -1)
+			fp->flag.is_eof = 1;
+		else
+			fp->flag.is_err = 1;
+		fp->cnt = 0;
+		return EOF;
+	}
+
+	return (unsigned char) *fp->ptr++;
+}