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partially-written draft of fmemopen, still in #if 0

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This commit is contained in:
Rich Felker 2011-03-14 11:49:55 -04:00
parent b446c55b6f
commit 9dd7d7e3f6
1 changed files with 49 additions and 4 deletions
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53
src/stdio/fmemopen.c
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@ -3,14 +3,59 @@
static ssize_t mread(FILE *f, unsigned char *buf, size_t len)
{
memcpy(buf,
size_t rem = f->memsize - f->mempos;
if (len > rem) len = rem;
memcpy(buf, f->membuf+f->mempos, len);
f->mempos += len;
return len;
}
static ssize_t mwrite(FILE *f, const unsigned char *buf, size_t len)
{
size_t rem;
if (f->memmode == 'a') f->mempos = f->memsize;
rem = f->memlim - f->mempos;
if (len > rem) len = rem;
memcpy(f->membuf+f->mempos, buf, len);
f->mempos += len;
if (f->mempos >= f->memsize) {
f->memsize = f->mempos;
}
return len;
}
FILE *fmemopen(void *buf, size_t size, const char *mode)
{
FILE *f = calloc(sizeof(FILE), 1);
if (!f) return 0;
FILE *f;
int plus = !!strchr(mode, '+');
//
if (!size || !strchr("rwa", *mode)) {
errno = EINVAL;
return 0;
}
if (!buf && size > SIZE_MAX-sizeof(FILE)-BUFSIZ-UNGET) {
errno = ENOMEM;
return 0;
}
f = calloc(sizeof(FILE) + UNGET + BUFSIZ + (buf?0:size), 1);
if (!f) return 0;
f->fd = -1;
f->lbf = EOF;
f->buf = (unsigned char *)(f+1) + UNGET;
f->buf_size = BUFSIZ;
if (!buf) buf = f->buf + BUFSIZ;
if (!plus) f->flags = (*mode == 'r') ? F_NOWR : F_NORD;
if (*mode == 'a') f->mempos = strchr(buf, 0)-buf;
f->read = mread;
f->write = mwrite;
f->seek = mseek;
f->flush = mflush;
f->close = mclose;
return f;
}
#endif