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Fix fread and fwrite implementation

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topjohnwu 2024-02-25 23:20:30 -08:00
parent 907bbbda41
commit 0ccd6e7381
1 changed files with 8 additions and 14 deletions
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22
native/src/crt0/stdio.c
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@ -8,7 +8,6 @@ typedef struct file_ptr_t {
void *cookie; void *cookie;
int (*read_fn)(void*, char*, int); int (*read_fn)(void*, char*, int);
int (*write_fn)(void*, const char*, int); int (*write_fn)(void*, const char*, int);
fpos_t (*seek_fn)(void*, fpos_t, int);
int (*close_fn)(void*); int (*close_fn)(void*);
} file_ptr_t; } file_ptr_t;
@ -22,11 +21,6 @@ static int fp_write_fn(void *p, const char *buf, int sz) {
return write(fd, buf, sz); return write(fd, buf, sz);
} }
static fpos_t fp_seek_fn(void *p, fpos_t pos, int whence) {
intptr_t fd = (intptr_t) p;
return lseek(fd, pos, whence);
}
static int fp_close_fn(void *p) { static int fp_close_fn(void *p) {
intptr_t fd = (intptr_t) p; intptr_t fd = (intptr_t) p;
return close(fd); return close(fd);
@ -37,7 +31,6 @@ static void set_fp_fd(file_ptr_t *fp, int fd) {
fp->cookie = NULL; fp->cookie = NULL;
fp->read_fn = fp_read_fn; fp->read_fn = fp_read_fn;
fp->write_fn = fp_write_fn; fp->write_fn = fp_write_fn;
fp->seek_fn = fp_seek_fn;
fp->close_fn = fp_close_fn; fp->close_fn = fp_close_fn;
} }
@ -69,17 +62,16 @@ FILE *funopen(const void* cookie,
fp->cookie = (void *) cookie; fp->cookie = (void *) cookie;
fp->read_fn = read_fn; fp->read_fn = read_fn;
fp->write_fn = write_fn; fp->write_fn = write_fn;
fp->seek_fn = seek_fn;
fp->close_fn = close_fn; fp->close_fn = close_fn;
return (FILE *) fp; return (FILE *) fp;
} }
#define fn_arg (fp->fd > 0 ? (void*)(intptr_t) fp->fd : fp->cookie) #define fn_arg (fp->fd < 0 ? fp->cookie : ((void*)(intptr_t) fp->fd))
int fclose(FILE *stream) { int fclose(FILE *stream) {
file_ptr_t *fp = (file_ptr_t *) stream; file_ptr_t *fp = (file_ptr_t *) stream;
int ret = fp->close_fn(fn_arg); int ret = fp->close_fn(fn_arg);
free(stream); free(fp);
return ret; return ret;
} }
@ -96,8 +88,9 @@ int fputc(int ch, FILE *stream) {
size_t fwrite(const void* buf, size_t size, size_t count, FILE* stream) { size_t fwrite(const void* buf, size_t size, size_t count, FILE* stream) {
file_ptr_t *fp = (file_ptr_t *) stream; file_ptr_t *fp = (file_ptr_t *) stream;
int ret = fp->write_fn(fn_arg, buf, size * count); int len = size * count;
return ret >= 0 ? ret : 0; int ret = fp->write_fn(fn_arg, buf, len);
return ret == len ? count : 0;
} }
int fputs(const char* s, FILE* stream) { int fputs(const char* s, FILE* stream) {
@ -117,8 +110,9 @@ int fgetc(FILE *stream) {
size_t fread(void *buf, size_t size, size_t count, FILE* stream) { size_t fread(void *buf, size_t size, size_t count, FILE* stream) {
file_ptr_t *fp = (file_ptr_t *) stream; file_ptr_t *fp = (file_ptr_t *) stream;
int ret = fp->read_fn(fn_arg, buf, size * count); int len = size * count;
return ret >= 0 ? ret : 0; int ret = fp->read_fn(fn_arg, buf, len);
return ret == len ? count : 0;
} }
void setbuf(FILE* fp, char* buf) {} void setbuf(FILE* fp, char* buf) {}