usr/klibc/fopen.c

/*
 * fopen.c
 */

#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>

/* This depends on O_RDONLY == 0, O_WRONLY == 1, O_RDWR == 2 */

FILE *fopen(const char *file, const char *mode)
{
	int flags = O_RDONLY;
	int plus = 0;

	while (*mode) {
		switch (*mode++) {
		case 'r':
			flags = O_RDONLY;
			break;
		case 'w':
			flags = O_WRONLY | O_CREAT | O_TRUNC;
			break;
		case 'a':
			flags = O_WRONLY | O_CREAT | O_APPEND;
			break;
		case '+':
			plus = 1;
			break;
		}
	}

	if (plus) {
		flags = (flags & ~(O_RDONLY | O_WRONLY)) | O_RDWR;
	}

	/* Note: __create_file(-1) == NULL, so this is safe */
	return __create_file(open(file, flags, 0666));
}
1	/*
2	* fopen.c
3	*/
4
5	#include <stdio.h>
6	#include <unistd.h>
7	#include <fcntl.h>
8
9	/* This depends on O_RDONLY == 0, O_WRONLY == 1, O_RDWR == 2 */
10
11	FILE fopen(const char file, const char *mode)
12	{
13	int flags = O_RDONLY;
14	int plus = 0;
15
16	while (*mode) {
17	switch (*mode++) {
18	case 'r':
19	flags = O_RDONLY;
20	break;
21	case 'w':
22	flags = O_WRONLY \| O_CREAT \| O_TRUNC;
23	break;
24	case 'a':
25	flags = O_WRONLY \| O_CREAT \| O_APPEND;
26	break;
27	case '+':
28	plus = 1;
29	break;
30	}
31	}
32
33	if (plus) {
34	flags = (flags & ~(O_RDONLY \| O_WRONLY)) \| O_RDWR;
35	}
36
37	/* Note: __create_file(-1) == NULL, so this is safe */
38	return __create_file(open(file, flags, 0666));
39	}