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#ifndef __STDIO_H__
#define __STDIO_H__
#include <reent.h>
#include <stdarg.h>
#include <stddef.h>
#include <unistd.h>
#include <malloc.h>
static const int EOF = -1;
struct _FILE {
int fd;
};
typedef struct _FILE FILE;
int printf(const char * format, ...);
int fprintf(FILE *stream, const char * format, ...);
int sprintf(char * str, const char * format, ...);
int snprintf(char * str, size_t size, const char * format, ...);
int asprintf(char ** strp, const char * format, ...);
int vprintf(const char * format, va_list ap);
int vfprintf(FILE *stream, const char * format, va_list ap);
int vsprintf(char * str, const char * format, va_list ap);
int vsnprintf(char * str, size_t size, const char * format, va_list ap);
int vasprintf(char ** strp, const char * format, va_list ap);
void __sinit(struct _reent *);
// We don't even buffer, so...
static inline int fflush(FILE *stream) { return 0; }
// hopefully, since all of the mode crap is static, gcc will optimize most of it away.
static inline FILE * fopen(const char * fname, const char * mode) {
FILE * r = NULL;
int flags = 0, plus = 0, append = 0, fd;
if (!mode || !mode[0]) {
_impure_ptr->_errno = EINVAL;
return NULL;
}
if (mode[1] == 'b') {
plus = mode[2] == '+';
} else if (mode[1]) {
if (mode[1] != '+') {
_impure_ptr->_errno = EINVAL;
return NULL;
}
plus = 1;
}
switch (mode[0]) {
case 'r':
if (plus) {
flags = O_RDWR;
} else {
flags = O_RDONLY;
}
break;
case 'w':
if (plus) {
flags = O_RDWR | O_CREAT | O_TRUNC;
} else {
flags = O_WRONLY | O_CREAT | O_TRUNC;
}
break;
case 'a':
append = 1;
if (plus) { // won't be properly supported
flags = O_RDWR | O_CREAT;
} else {
flags = O_WRONLY | O_CREAT;
}
break;
default:
_impure_ptr->_errno = EINVAL;
return NULL;
}
fd = open(fname, flags);
if (fd >= 0) {
r = (FILE *) malloc(sizeof(FILE));
r->fd = fd;
}
return r;
}
static inline int fclose(FILE * stream) {
int fd;
if (!stream) {
_impure_ptr->_errno = EINVAL;
return -1;
}
fd = stream->fd;
free(stream);
return close(fd);
}
// Again, the compiler should do the right thing, and optimize depending on the values of size and nmemb.
// Luckily, we always will get into the short cases.
static inline size_t fread(void * _ptr, size_t size, size_t nmemb, FILE * stream) {
int i;
uint8_t * ptr = (uint8_t *) _ptr;
if (!stream) {
_impure_ptr->_errno = EINVAL;
return -1;
}
if (size == 1)
return read(stream->fd, ptr, nmemb);
if (nmemb == 1)
return read(stream->fd, ptr, size) == size ? 1 : 0;
for (i = 0; i < nmemb; i++) {
if (read(stream->fd, ptr + size * i, size) != size)
return i;
}
return nmemb;
}
static inline size_t fwrite(const void * _ptr, size_t size, size_t nmemb, FILE * stream) {
int i;
const uint8_t * ptr = (const uint8_t *) _ptr;
if (!stream) {
_impure_ptr->_errno = EINVAL;
return -1;
}
if (size == 1)
return write(stream->fd, ptr, nmemb);
if (nmemb == 1)
return write(stream->fd, ptr, size) == size ? 1 : 0;
for (i = 0; i < nmemb; i++) {
if (write(stream->fd, ptr + size * i, size) != size)
return i;
}
return nmemb;
}
extern FILE * stdin, * stdout, * stderr;
#endif
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