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impl pic_fread with buffering

This commit is contained in:
Yuichi Nishiwaki 2014-01-16 18:41:10 +09:00
parent fc506674c0
commit 9897f7581f
2 changed files with 35 additions and 0 deletions
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1
include/picrin/port.h
View File

@ -47,6 +47,7 @@ struct pic_port *pic_stderr(pic_state *);
int pic_setvbuf(pic_file *, char *, int, size_t);
int pic_fflush(pic_file *);
int pic_ffill(pic_file *);
pic_file *pic_funopen(void *cookie, int (*read)(void *, char *, int), int (*write)(void *, const char *, int), fpos_t (*seek)(void *, fpos_t, int), int (*close)(void *));

34
src/port.c
View File

@ -71,6 +71,12 @@ pic_fflush(pic_file *file)
return file->vtable.write(file->vtable.cookie, file->s, file->c - file->s);
}
int
pic_ffill(pic_file *file)
{
return file->vtable.read(file->vtable.cookie, file->c, file->e - file->c);
}
pic_file *
pic_funopen(void *cookie,
int (*read)(void *, char *, int),
@ -149,6 +155,34 @@ pic_fclose(pic_file *file)
return 0;
}
size_t
pic_fread(void *ptr, size_t block, size_t nitems, pic_file *file)
{
int size, avail;
char *dst = (char *)ptr;
size = block * nitems; /* TODO: optimize block read */
while (1) {
avail = file->c - file->s;
if (size <= avail) {
memcpy(dst, file->s, size);
file->c -= size;
memmove(file->s, file->c, avail - size);
break;
}
else {
memcpy(dst, file->s, avail);
file->c -= avail;
size -= avail;
dst += avail;
pic_ffill(file);
}
}
return block * nitems;
}
size_t
pic_fwrite(const void *ptr, size_t block, size_t nitems, pic_file *file)
{