From 21dd9ae5a4e9f717f3957ec934dd3158129436b8 Mon Sep 17 00:00:00 2001 From: Franck Bui-Huu Date: Mon, 20 Dec 2010 15:18:05 +0100 Subject: perf probe: Handle gracefully some stupid and buggy line syntaxes Currently perf probe doesn't handle those incorrect syntaxes: $ perf probe -L sched.c:++13 $ perf probe -L sched.c:-+13 $ perf probe -L sched.c:10000000000000000000000000000+13 This patches rewrites parse_line_range_desc() to handle them. As a bonus, it reports more useful error messages instead of: "Tailing with invalid character...". Acked-by: Masami Hiramatsu Cc: Masami Hiramatsu LKML-Reference: <1292854685-8230-7-git-send-email-fbuihuu@gmail.com> Signed-off-by: Franck Bui-Huu Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/probe-event.c | 92 ++++++++++++++++++++++++++++--------------- 1 file changed, 60 insertions(+), 32 deletions(-) (limited to 'tools/perf/util/probe-event.c') diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c index 80cc0bc284fd..099336ed34b4 100644 --- a/tools/perf/util/probe-event.c +++ b/tools/perf/util/probe-event.c @@ -529,6 +529,19 @@ int show_available_vars(struct perf_probe_event *pevs __unused, } #endif +static int parse_line_num(char **ptr, int *val, const char *what) +{ + const char *start = *ptr; + + errno = 0; + *val = strtol(*ptr, ptr, 0); + if (errno || *ptr == start) { + semantic_error("'%s' is not a valid number.\n", what); + return -EINVAL; + } + return 0; +} + /* * Stuff 'lr' according to the line range described by 'arg'. * The line range syntax is described by: @@ -538,50 +551,65 @@ int show_available_vars(struct perf_probe_event *pevs __unused, */ int parse_line_range_desc(const char *arg, struct line_range *lr) { - const char *ptr; - char *tmp; + char *range, *name = strdup(arg); + int err; + + if (!name) + return -ENOMEM; + + lr->start = 0; + lr->end = INT_MAX; + + range = strchr(name, ':'); + if (range) { + *range++ = '\0'; + + err = parse_line_num(&range, &lr->start, "start line"); + if (err) + goto err; + + if (*range == '+' || *range == '-') { + const char c = *range++; + + err = parse_line_num(&range, &lr->end, "end line"); + if (err) + goto err; + + if (c == '+') { + lr->end += lr->start; + /* + * Adjust the number of lines here. + * If the number of lines == 1, the + * the end of line should be equal to + * the start of line. + */ + lr->end--; + } + } - ptr = strchr(arg, ':'); - if (ptr) { - lr->start = (int)strtoul(ptr + 1, &tmp, 0); - if (*tmp == '+') { - lr->end = lr->start + (int)strtoul(tmp + 1, &tmp, 0); - lr->end--; /* - * Adjust the number of lines here. - * If the number of lines == 1, the - * the end of line should be equal to - * the start of line. - */ - } else if (*tmp == '-') - lr->end = (int)strtoul(tmp + 1, &tmp, 0); - else - lr->end = INT_MAX; pr_debug("Line range is %d to %d\n", lr->start, lr->end); + + err = -EINVAL; if (lr->start > lr->end) { semantic_error("Start line must be smaller" " than end line.\n"); - return -EINVAL; + goto err; } - if (*tmp != '\0') { - semantic_error("Tailing with invalid character '%d'.\n", - *tmp); - return -EINVAL; + if (*range != '\0') { + semantic_error("Tailing with invalid str '%s'.\n", range); + goto err; } - tmp = strndup(arg, (ptr - arg)); - } else { - tmp = strdup(arg); - lr->end = INT_MAX; } - if (tmp == NULL) - return -ENOMEM; - - if (strchr(tmp, '.')) - lr->file = tmp; + if (strchr(name, '.')) + lr->file = name; else - lr->function = tmp; + lr->function = name; return 0; +err: + free(name); + return err; } /* Check the name is good for event/group */ -- cgit v1.2.3-59-g8ed1b