ref: d4eb944af8f3300db2c7683dec0f8d1fb431560c
dir: /src/libc/stdio/_fpopen.c/
#include <errno.h> #include <stdio.h> #include <stdlib.h> #include <sys.h> #include "../syscall.h" #include "../libc.h" FILE * _fpopen(const char *restrict fname, const char *restrict mode, FILE * restrict fp) { int i, flags, fd, rw, bin; flags = rw = bin = 0; if (mode[0] == '\0') goto einval; for (i = 1; mode[i]; ++i) { switch (mode[i]) { case '+': if (rw) goto einval; rw = 1; break; case 'b': if (bin) goto einval; bin = 1; break; default: goto einval; } } switch (mode[0]) { case 'a': flags |= O_APPEND | O_CREAT; goto wrflags; case 'w': flags |= O_TRUNC | O_CREAT; wrflags: flags |= (rw) ? O_RDWR : O_WRONLY; break; case 'r': flags = (rw) ? O_RDWR : O_RDONLY; break; default: einval: errno = EINVAL; return NULL; } if ((fd = _open(fname, flags, 0666)) < 0) return NULL; fp->buf = NULL; fp->fd = fd; if (!bin) fp->flags |= _IOTXT; switch (flags & O_ACCMODE) { case O_RDWR: fp->flags |= _IORW; break; case O_RDONLY: fp->flags |= _IOREAD; break; case O_WRONLY: fp->flags |= _IOWRITE; break; } fp->lp = fp->rp = fp->wp = NULL; return fp; }