From 5cea57f30a12443c05e0c5273f35d2fcef00d30a Mon Sep 17 00:00:00 2001 From: Masami Hiramatsu Date: Tue, 10 May 2016 14:46:58 +0900 Subject: [PATCH] perf tools: Rewrite strbuf not to die() Rewrite strbuf implementation not to use die() nor xrealloc(). Instead of die(), now most of the API returns error code or 0 if succeeded. Suggested-by: Arnaldo Carvalho de Melo Signed-off-by: Masami Hiramatsu Cc: Namhyung Kim Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/20160510054658.6158.24080.stgit@devbox Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/strbuf.c | 93 +++++++++++++++++++++++++++++----------- tools/perf/util/strbuf.h | 25 ++++++----- 2 files changed, 82 insertions(+), 36 deletions(-) diff --git a/tools/perf/util/strbuf.c b/tools/perf/util/strbuf.c index 8fb73295ec34..f95f682aa2b2 100644 --- a/tools/perf/util/strbuf.c +++ b/tools/perf/util/strbuf.c @@ -1,3 +1,4 @@ +#include "debug.h" #include "cache.h" #include @@ -17,12 +18,13 @@ int prefixcmp(const char *str, const char *prefix) */ char strbuf_slopbuf[1]; -void strbuf_init(struct strbuf *sb, ssize_t hint) +int strbuf_init(struct strbuf *sb, ssize_t hint) { sb->alloc = sb->len = 0; sb->buf = strbuf_slopbuf; if (hint) - strbuf_grow(sb, hint); + return strbuf_grow(sb, hint); + return 0; } void strbuf_release(struct strbuf *sb) @@ -42,67 +44,104 @@ char *strbuf_detach(struct strbuf *sb, size_t *sz) return res; } -void strbuf_grow(struct strbuf *sb, size_t extra) +int strbuf_grow(struct strbuf *sb, size_t extra) { - if (sb->len + extra + 1 <= sb->len) - die("you want to use way too much memory"); - if (!sb->alloc) - sb->buf = NULL; - ALLOC_GROW(sb->buf, sb->len + extra + 1, sb->alloc); + char *buf; + size_t nr = sb->len + extra + 1; + + if (nr < sb->alloc) + return 0; + + if (nr <= sb->len) + return -E2BIG; + + if (alloc_nr(sb->alloc) > nr) + nr = alloc_nr(sb->alloc); + + /* + * Note that sb->buf == strbuf_slopbuf if sb->alloc == 0, and it is + * a static variable. Thus we have to avoid passing it to realloc. + */ + buf = realloc(sb->alloc ? sb->buf : NULL, nr * sizeof(*buf)); + if (!buf) + return -ENOMEM; + + sb->buf = buf; + sb->alloc = nr; + return 0; } -void strbuf_addch(struct strbuf *sb, int c) +int strbuf_addch(struct strbuf *sb, int c) { - strbuf_grow(sb, 1); + int ret = strbuf_grow(sb, 1); + if (ret) + return ret; + sb->buf[sb->len++] = c; sb->buf[sb->len] = '\0'; + return 0; } -void strbuf_add(struct strbuf *sb, const void *data, size_t len) +int strbuf_add(struct strbuf *sb, const void *data, size_t len) { - strbuf_grow(sb, len); + int ret = strbuf_grow(sb, len); + if (ret) + return ret; + memcpy(sb->buf + sb->len, data, len); - strbuf_setlen(sb, sb->len + len); + return strbuf_setlen(sb, sb->len + len); } -static void strbuf_addv(struct strbuf *sb, const char *fmt, va_list ap) +static int strbuf_addv(struct strbuf *sb, const char *fmt, va_list ap) { - int len; + int len, ret; va_list ap_saved; - if (!strbuf_avail(sb)) - strbuf_grow(sb, 64); + if (!strbuf_avail(sb)) { + ret = strbuf_grow(sb, 64); + if (ret) + return ret; + } va_copy(ap_saved, ap); len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap); if (len < 0) - die("your vsnprintf is broken"); + return len; if (len > strbuf_avail(sb)) { - strbuf_grow(sb, len); + ret = strbuf_grow(sb, len); + if (ret) + return ret; len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap_saved); va_end(ap_saved); if (len > strbuf_avail(sb)) { - die("this should not happen, your vsnprintf is broken"); + pr_debug("this should not happen, your vsnprintf is broken"); + return -EINVAL; } } - strbuf_setlen(sb, sb->len + len); + return strbuf_setlen(sb, sb->len + len); } -void strbuf_addf(struct strbuf *sb, const char *fmt, ...) +int strbuf_addf(struct strbuf *sb, const char *fmt, ...) { va_list ap; + int ret; va_start(ap, fmt); - strbuf_addv(sb, fmt, ap); + ret = strbuf_addv(sb, fmt, ap); va_end(ap); + return ret; } ssize_t strbuf_read(struct strbuf *sb, int fd, ssize_t hint) { size_t oldlen = sb->len; size_t oldalloc = sb->alloc; + int ret; + + ret = strbuf_grow(sb, hint ? hint : 8192); + if (ret) + return ret; - strbuf_grow(sb, hint ? hint : 8192); for (;;) { ssize_t cnt; @@ -112,12 +151,14 @@ ssize_t strbuf_read(struct strbuf *sb, int fd, ssize_t hint) strbuf_release(sb); else strbuf_setlen(sb, oldlen); - return -1; + return cnt; } if (!cnt) break; sb->len += cnt; - strbuf_grow(sb, 8192); + ret = strbuf_grow(sb, 8192); + if (ret) + return ret; } sb->buf[sb->len] = '\0'; diff --git a/tools/perf/util/strbuf.h b/tools/perf/util/strbuf.h index ab9be0fbbd40..54b409297d4a 100644 --- a/tools/perf/util/strbuf.h +++ b/tools/perf/util/strbuf.h @@ -51,7 +51,7 @@ struct strbuf { #define STRBUF_INIT { 0, 0, strbuf_slopbuf } /*----- strbuf life cycle -----*/ -void strbuf_init(struct strbuf *buf, ssize_t hint); +int strbuf_init(struct strbuf *buf, ssize_t hint); void strbuf_release(struct strbuf *buf); char *strbuf_detach(struct strbuf *buf, size_t *); @@ -60,26 +60,31 @@ static inline ssize_t strbuf_avail(const struct strbuf *sb) { return sb->alloc ? sb->alloc - sb->len - 1 : 0; } -void strbuf_grow(struct strbuf *buf, size_t); +int strbuf_grow(struct strbuf *buf, size_t); -static inline void strbuf_setlen(struct strbuf *sb, size_t len) { - if (!sb->alloc) - strbuf_grow(sb, 0); +static inline int strbuf_setlen(struct strbuf *sb, size_t len) { + int ret; + if (!sb->alloc) { + ret = strbuf_grow(sb, 0); + if (ret) + return ret; + } assert(len < sb->alloc); sb->len = len; sb->buf[len] = '\0'; + return 0; } /*----- add data in your buffer -----*/ -void strbuf_addch(struct strbuf *sb, int c); +int strbuf_addch(struct strbuf *sb, int c); -void strbuf_add(struct strbuf *buf, const void *, size_t); -static inline void strbuf_addstr(struct strbuf *sb, const char *s) { - strbuf_add(sb, s, strlen(s)); +int strbuf_add(struct strbuf *buf, const void *, size_t); +static inline int strbuf_addstr(struct strbuf *sb, const char *s) { + return strbuf_add(sb, s, strlen(s)); } __attribute__((format(printf,2,3))) -void strbuf_addf(struct strbuf *sb, const char *fmt, ...); +int strbuf_addf(struct strbuf *sb, const char *fmt, ...); /* XXX: if read fails, any partial read is undone */ ssize_t strbuf_read(struct strbuf *, int fd, ssize_t hint); -- 2.20.1