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Stream positioning funcs

This commit is contained in:
bumbread 2022-07-29 01:16:23 +11:00
parent e58cf8d645
commit 23d859e793
2 changed files with 16 additions and 3 deletions
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2
inc/stdio.h
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@ -43,9 +43,9 @@ typedef struct {
#define L_tmpnam FILENAME_MAX #define L_tmpnam FILENAME_MAX
#define SEEK_SET 0
#define SEEK_CUR 1 #define SEEK_CUR 1
#define SEEK_END 2 #define SEEK_END 2
#define SEEK_SET 0
#ifdef _os_win #ifdef _os_win
#define TMP_MAX SHORT_MAX #define TMP_MAX SHORT_MAX

17
src/_win/stdio.c
View File

@ -426,6 +426,13 @@ int fgetpos(FILE *restrict stream, fpos_t *restrict pos) {
} }
int fseek(FILE *stream, long int offset, int whence) { int fseek(FILE *stream, long int offset, int whence) {
// Note(bumbread): the SEEK_SET, SEEK_CUR and SEEK_END are defined to match
// Windows' constants, so no conversion is requierd between them.
LONG pos_hi = 0;
DWORD pos_lo = SetFilePointer(stream->handle, offset, &pos_hi, whence);
if(pos_lo == INVALID_SET_FILE_POINTER) {
return -1L;
}
return 0; return 0;
} }
@ -441,11 +448,17 @@ int fsetpos(FILE *stream, const fpos_t *pos) {
} }
long int ftell(FILE *stream) { long int ftell(FILE *stream) {
return 0; LONG pos_hi = 0;
DWORD pos_lo = SetFilePointer(stream->handle, 0, &pos_hi, FILE_CURRENT);
if(pos_lo == INVALID_SET_FILE_POINTER) {
return -1L;
}
int64_t offset = ((int64_t)pos_hi << 32) | (int64_t)pos_lo;
return offset;
} }
void rewind(FILE *stream) { void rewind(FILE *stream) {
fseek(stream, 0, SEEK_SET);
} }
int getchar(void) { int getchar(void) {