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#ifndef STRBUF_H
#define STRBUF_H
/*
* Strbuf's can be use in many ways: as a byte array, or to store arbitrary
* long, overflow safe strings.
*
* Strbufs has some invariants that are very important to keep in mind:
*
* 1. the ->buf member is always malloc-ed, hence strbuf's can be used to
* build complex strings/buffers whose final size isn't easily known.
*
* It is legal to copy the ->buf pointer away. Though if you want to reuse
* the strbuf after that, setting ->buf to NULL isn't legal.
* `strbuf_detach' is the operation that detachs a buffer from its shell
* while keeping the shell valid wrt its invariants.
*
* 2. the ->buf member is a byte array that has at least ->len + 1 bytes
* allocated. The extra byte is used to store a '\0', allowing the ->buf
* member to be a valid C-string. Every strbuf function ensure this
* invariant is preserved.
*
* Note that it is OK to "play" with the buffer directly if you work it
* that way:
*
* strbuf_grow(sb, SOME_SIZE);
* // ... here the memory areay starting at sb->buf, and of length
* // sb_avail(sb) is all yours, and you are sure that sb_avail(sb) is at
* // least SOME_SIZE
* strbuf_setlen(sb, sb->len + SOME_OTHER_SIZE);
*
* Of course, SOME_OTHER_SIZE must be smaller or equal to sb_avail(sb).
*
* Doing so is safe, though if it has to be done in many places, adding the
* missing API to the strbuf module is the way to go.
*
* XXX: do _not_ assume that the area that is yours is of size ->alloc - 1
* even if it's true in the current implementation. Alloc is somehow a
* "private" member that should not be messed with.
*/
#include <assert.h>
struct strbuf {
size_t alloc;
size_t len;
int eof;
char *buf;
};
#define STRBUF_INIT { 0, 0, 0, NULL }
/*----- strbuf life cycle -----*/
extern void strbuf_init(struct strbuf *);
extern void strbuf_release(struct strbuf *);
extern void strbuf_reset(struct strbuf *);
extern char *strbuf_detach(struct strbuf *);
/*----- strbuf size related -----*/
static inline size_t strbuf_avail(struct strbuf *sb) {
return sb->alloc ? sb->alloc - sb->len - 1 : 0;
}
static inline void strbuf_setlen(struct strbuf *sb, size_t len) {
assert (len < sb->alloc);
sb->len = len;
sb->buf[len] = '\0';
}
extern void strbuf_grow(struct strbuf *, size_t);
/*----- add data in your buffer -----*/
static inline void strbuf_addch(struct strbuf *sb, int c) {
strbuf_grow(sb, 1);
sb->buf[sb->len++] = c;
sb->buf[sb->len] = '\0';
}
extern void strbuf_add(struct strbuf *, const void *, size_t);
static inline void strbuf_addstr(struct strbuf *sb, const char *s) {
strbuf_add(sb, s, strlen(s));
}
static inline void strbuf_addbuf(struct strbuf *sb, struct strbuf *sb2) {
strbuf_add(sb, sb2->buf, sb2->len);
}
__attribute__((format(printf,2,3)))
extern void strbuf_addf(struct strbuf *sb, const char *fmt, ...);
extern size_t strbuf_fread(struct strbuf *, size_t, FILE *);
/* XXX: if read fails, any partial read is undone */
extern ssize_t strbuf_read(struct strbuf *, int fd);
extern void read_line(struct strbuf *, FILE *, int);
#endif /* STRBUF_H */
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