9os

commit 548f490090944f6f774e0833bef40f9c8bfce6e8
parent edba2453ded15fda8c0302757cafbc994003773c
Author: Roberto Vargas <roberto.vargas@arm.com>
Date:   Wed, 17 Oct 2018 18:26:28 +0100

[libc] Import __getc.c from scc

Change-Id: I3b3bdeda22c73b983b728770fd7a8aec0fe3ad34

Diffstat:
M
src/libc/Makefile
 | 
1
+
A
src/libc/__getc.c
 | 
45
+++++++++++++++++++++++++++++++++++++++++++++

2 files changed, 46 insertions(+), 0 deletions(-)
diff --git a/src/libc/Makefile b/src/libc/Makefile
@@ -15,6 +15,7 @@ COBJ = abort.o \
        memset.o \
        printk.o \
        __putc.o \
+       __getc.o \
        ctype.o \
        isalnum.o \
        isalpha.o \
diff --git a/src/libc/__getc.c b/src/libc/__getc.c
@@ -0,0 +1,45 @@
+#include <errno.h>
+#include <stdio.h>
+#include "syscall.h"
+#undef getc
+
+int
+__getc(FILE *fp)
+{
+	int cnt;
+
+	if (fp->flags & (_IOEOF | _IOERR))
+		return EOF;
+
+	if ((fp->flags & (_IOREAD | _IORW)) == 0) {
+		fp->flags |= _IOERR;
+		errno = EBADF;
+		return EOF;
+	}
+
+	if (fp->flags & _IOSTRG) {
+		fp->flags |= _IOEOF;
+		return EOF;
+	}
+
+	if (fp->buf == NULL) {
+		if ((fp->buf = malloc(BUFSIZ)) == NULL) {
+			errno = ENOMEM;
+			return EOF;
+		}
+		fp->len = BUFSIZ;
+		fp->flags |= _IOALLOC;
+		fp->lp = fp->rp = fp->wp = fp->buf;
+	}
+
+	if ((cnt = _read(fp->fd, fp->buf, fp->len)) <= 0) {
+		fp->flags |= (cnt == 0) ? _IOEOF : _IOERR;
+		return EOF;
+	}
+
+	fp->flags |= _IOREAD;
+	fp->rp = fp->buf;
+	fp->wp = fp->buf + cnt;
+
+	return *fp->rp++;
+}