#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 NOT legal to copy the ->buf pointer away. * `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 array starting at sb->buf, and of length * ... strbuf_avail(sb) is all yours, and you are sure that * ... strbuf_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 strbuf_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> extern char strbuf_slopbuf[]; struct strbuf { size_t alloc; size_t len; char *buf; }; #define STRBUF_INIT { 0, 0, strbuf_slopbuf } /*----- strbuf life cycle -----*/ extern void strbuf_init(struct strbuf *, size_t); extern void strbuf_release(struct strbuf *); extern char *strbuf_detach(struct strbuf *, size_t *); extern void strbuf_attach(struct strbuf *, void *, size_t, size_t); static inline void strbuf_swap(struct strbuf *a, struct strbuf *b) { struct strbuf tmp = *a; *a = *b; *b = tmp; } /*----- strbuf size related -----*/ static inline size_t strbuf_avail(struct strbuf *sb) { return sb->alloc ? sb->alloc - sb->len - 1 : 0; } extern void strbuf_grow(struct strbuf *, size_t); static inline void strbuf_setlen(struct strbuf *sb, size_t len) { if (!sb->alloc) strbuf_grow(sb, 0); assert(len < sb->alloc); sb->len = len; sb->buf[len] = '\0'; } #define strbuf_reset(sb) strbuf_setlen(sb, 0) /*----- content related -----*/ extern void strbuf_rtrim(struct strbuf *); extern int strbuf_cmp(struct strbuf *, struct strbuf *); /*----- 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_insert(struct strbuf *, size_t pos, const void *, size_t); extern void strbuf_remove(struct strbuf *, size_t pos, size_t len); /* splice pos..pos+len with given data */ extern void strbuf_splice(struct strbuf *, size_t pos, size_t len, const void *, size_t); 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); } extern void strbuf_adddup(struct strbuf *sb, size_t pos, size_t len); typedef void (*expand_fn_t) (struct strbuf *sb, const char *placeholder, void *context); extern void strbuf_expand(struct strbuf *sb, const char *format, const char **placeholders, expand_fn_t fn, void *context); __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, size_t hint); extern int strbuf_read_file(struct strbuf *sb, const char *path, size_t hint); extern int strbuf_getline(struct strbuf *, FILE *, int); extern void stripspace(struct strbuf *buf, int skip_comments); extern void launch_editor(const char *path, struct strbuf *buffer, const char *const *env); #endif /* STRBUF_H */