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clean up allocation/setup logic for fmemopen

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rather than manually performing pointer arithmetic to carve multiple
objects out of one allocation, use a containing struct that
encompasses them all.
This commit is contained in:
Rich Felker
2018-04-18 14:57:10 -04:00
parent 4245a233c1
commit 0b043c7b70
1 changed files with 31 additions and 21 deletions
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62
src/stdio/fmemopen.c
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@ -9,6 +9,12 @@ struct cookie {
int mode; int mode;
}; };
struct mem_FILE {
FILE f;
struct cookie c;
unsigned char buf[UNGET+BUFSIZ], buf2[];
};
static off_t mseek(FILE *f, off_t off, int whence) static off_t mseek(FILE *f, off_t off, int whence)
{ {
ssize_t base; ssize_t base;
@ -72,8 +78,7 @@ static int mclose(FILE *m)
FILE *fmemopen(void *restrict buf, size_t size, const char *restrict mode) FILE *fmemopen(void *restrict buf, size_t size, const char *restrict mode)
{ {
FILE *f; struct mem_FILE *f;
struct cookie *c;
int plus = !!strchr(mode, '+'); int plus = !!strchr(mode, '+');
if (!size || !strchr("rwa", *mode)) { if (!size || !strchr("rwa", *mode)) {
@ -86,29 +91,34 @@ FILE *fmemopen(void *restrict buf, size_t size, const char *restrict mode)
return 0; return 0;
} }
f = calloc(sizeof *f + sizeof *c + UNGET + BUFSIZ + (buf?0:size), 1); f = malloc(sizeof *f + (buf?0:size));
if (!f) return 0; if (!f) return 0;
f->cookie = c = (void *)(f+1); memset(&f->f, 0, sizeof f->f);
f->fd = -1; f->f.cookie = &f->c;
f->lbf = EOF; f->f.fd = -1;
f->buf = (unsigned char *)(c+1) + UNGET; f->f.lbf = EOF;
f->buf_size = BUFSIZ; f->f.buf = f->buf + UNGET;
if (!buf) buf = f->buf + BUFSIZ; f->f.buf_size = sizeof f->buf - UNGET;
if (!buf) {
c->buf = buf; buf = f->buf2;;
c->size = size; memset(buf, 0, size);
c->mode = *mode; }
if (!plus) f->flags = (*mode == 'r') ? F_NOWR : F_NORD; memset(&f->c, 0, sizeof f->c);
if (*mode == 'r') c->len = size; f->c.buf = buf;
else if (*mode == 'a') c->len = c->pos = strnlen(buf, size); f->c.size = size;
f->c.mode = *mode;
f->read = mread;
f->write = mwrite; if (!plus) f->f.flags = (*mode == 'r') ? F_NOWR : F_NORD;
f->seek = mseek; if (*mode == 'r') f->c.len = size;
f->close = mclose; else if (*mode == 'a') f->c.len = f->c.pos = strnlen(buf, size);
if (!libc.threaded) f->lock = -1; f->f.read = mread;
f->f.write = mwrite;
return __ofl_add(f); f->f.seek = mseek;
f->f.close = mclose;
if (!libc.threaded) f->f.lock = -1;
return __ofl_add(&f->f);
} }