88 lines
1.8 KiB
C
88 lines
1.8 KiB
C
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/**
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* See Copyright Notice in picrin.h
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*/
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#include <stdio.h>
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#include "picrin.h"
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#if PIC_USE_LIBC
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static int
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file_read(pic_state *PIC_UNUSED(pic), void *cookie, char *ptr, int size) {
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FILE *file = cookie;
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int r;
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size = 1; /* override size */
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r = (int)fread(ptr, 1, (size_t)size, file);
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if (r < size && ferror(file)) {
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return -1;
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}
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if (r == 0 && feof(file)) {
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clearerr(file);
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}
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return r;
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}
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static int
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file_write(pic_state *PIC_UNUSED(pic), void *cookie, const char *ptr, int size) {
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FILE *file = cookie;
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int r;
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r = (int)fwrite(ptr, 1, (size_t)size, file);
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if (r < size) {
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return -1;
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}
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fflush(cookie);
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return r;
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}
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static long
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file_seek(pic_state *PIC_UNUSED(pic), void *cookie, long pos, int whence) {
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switch (whence) {
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case PIC_SEEK_CUR:
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whence = SEEK_CUR;
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break;
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case PIC_SEEK_SET:
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whence = SEEK_SET;
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break;
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case PIC_SEEK_END:
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whence = SEEK_END;
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break;
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}
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if (fseek(cookie, pos, whence) == 0) {
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return ftell(cookie);
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}
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return -1;
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}
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static int
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file_close(pic_state *PIC_UNUSED(pic), void *cookie) {
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return fclose(cookie);
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}
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pic_value
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pic_fopen(pic_state *pic, FILE *fp, const char *mode) {
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static const pic_port_type file_rd = { file_read, 0, file_seek, file_close };
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static const pic_port_type file_wr = { 0, file_write, file_seek, file_close };
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if (*mode == 'r') {
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return pic_funopen(pic, fp, &file_rd);
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} else {
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return pic_funopen(pic, fp, &file_wr);
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}
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}
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void
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pic_init_file(pic_state *PIC_UNUSED(pic))
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{
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#if PIC_USE_STDIO
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pic_defvar(pic, "current-input-port", pic_fopen(pic, stdin, "r"));
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pic_defvar(pic, "current-output-port", pic_fopen(pic, stdout, "w"));
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pic_defvar(pic, "current-error-port", pic_fopen(pic, stdout, "w"));
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#endif
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}
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#endif
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