linux/tools/perf/util/strbuf.h
Namhyung Kim c711836972 perf tools: Introduce usage_with_options_msg()
Now usage_with_options() setup a pager before printing message so normal
printf() or pr_err() will not be shown.  The usage_with_options_msg()
can be used to print some help message before usage strings.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1445701767-12731-4-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2015-10-27 09:28:44 -03:00

95 lines
3.1 KiB
C

#ifndef __PERF_STRBUF_H
#define __PERF_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>
#include <stdarg.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 *buf, ssize_t hint);
extern void strbuf_release(struct strbuf *);
extern char *strbuf_detach(struct strbuf *, size_t *);
/*----- strbuf size related -----*/
static inline ssize_t strbuf_avail(const 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';
}
/*----- 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_remove(struct strbuf *, size_t pos, size_t len);
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));
}
__attribute__((format(printf,2,3)))
extern void strbuf_addf(struct strbuf *sb, const char *fmt, ...);
extern void strbuf_addv(struct strbuf *sb, const char *fmt, va_list ap);
/* XXX: if read fails, any partial read is undone */
extern ssize_t strbuf_read(struct strbuf *, int fd, ssize_t hint);
#endif /* __PERF_STRBUF_H */