| /* |
| * fopen.c |
| */ |
| |
| #include "stdioint.h" |
| |
| static int __parse_open_mode(const char *mode) |
| { |
| int rwflags = O_RDONLY; |
| int crflags = 0; |
| int eflags = 0; |
| |
| while (*mode) { |
| switch (*mode++) { |
| case 'r': |
| rwflags = O_RDONLY; |
| crflags = 0; |
| break; |
| case 'w': |
| rwflags = O_WRONLY; |
| crflags = O_CREAT | O_TRUNC; |
| break; |
| case 'a': |
| rwflags = O_WRONLY; |
| crflags = O_CREAT | O_APPEND; |
| break; |
| case 'e': |
| eflags |= O_CLOEXEC; |
| break; |
| case 'x': |
| eflags |= O_EXCL; |
| break; |
| case '+': |
| rwflags = O_RDWR; |
| break; |
| } |
| } |
| |
| return rwflags | crflags | eflags; |
| } |
| |
| FILE *fopen(const char *file, const char *mode) |
| { |
| int flags = __parse_open_mode(mode); |
| int fd, err; |
| FILE *f; |
| |
| fd = open(file, flags, 0666); |
| if (fd < 0) |
| return NULL; |
| |
| f = fdopen(fd, mode); |
| if (!f) { |
| err = errno; |
| close(fd); |
| errno = err; |
| } |
| return f; |
| } |