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libc: Parse the mode string

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This commit is contained in:
apio 2022-10-28 17:02:08 +02:00
parent 8ed0ff1381
commit b2f321c0b8
1 changed files with 32 additions and 4 deletions
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36
libs/libc/src/file.cpp
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@ -3,13 +3,14 @@
#include <luna.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
FILE* stderr;
FILE* stdout;
FILE* stdin;
void file_read_buf(FILE* stream)
static void file_read_buf(FILE* stream)
{
if (!stream->f_buf)
{
@ -31,6 +32,29 @@ void file_read_buf(FILE* stream)
stream->f_bufsize = nread;
}
static int file_parse_mode(const char* mode)
{
int flags = 0;
switch (mode[0])
{
case 'r': flags |= O_RDONLY; break;
case 'w':
flags |= O_WRONLY;
flags |= O_CREAT;
flags |= O_TRUNC;
break;
case 'a':
flags |= O_WRONLY;
flags |= O_CREAT;
flags |= O_APPEND;
break;
default: errno = EINVAL; return -1;
}
if (strchr(mode, '+')) flags |= O_RDWR;
return flags;
}
extern "C"
{
int fclose(FILE* stream)
@ -56,7 +80,9 @@ extern "C"
FILE* fopen(const char* pathname, const char* mode)
{
int fd = open(pathname, O_RDWR); // FIXME: Use the mode string.
int flags = file_parse_mode(mode);
if (flags < 0) return NULL;
int fd = open(pathname, flags, 0666); // If we create the file, create it as rw-rw-rw-.
if (fd < 0) { return 0; }
return fdopen(fd, mode);
}
@ -78,10 +104,12 @@ extern "C"
return stream;
}
FILE* freopen(const char* pathname, const char*,
FILE* freopen(const char* pathname, const char* mode,
FILE* stream) // FIXME: If pathname is NULL, open the original file with the new mode.
{
int fd = open(pathname, O_RDWR); // FIXME: Use the mode string.
int flags = file_parse_mode(mode);
if (flags < 0) return NULL;
int fd = open(pathname, flags, 0666); // If we create the file, create it as rw-rw-rw-.
if (fd < 0) { return 0; }
fflush(stream); // To make it future-proof.