diff options
Diffstat (limited to 'libbb/trace.c')
-rw-r--r-- | libbb/trace.c | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/libbb/trace.c b/libbb/trace.c new file mode 100644 index 000000000..4229ae123 --- /dev/null +++ b/libbb/trace.c | |||
@@ -0,0 +1,127 @@ | |||
1 | /* | ||
2 | * GIT - The information manager from hell | ||
3 | * | ||
4 | * Copyright (C) 2000-2002 Michael R. Elkins <me@mutt.org> | ||
5 | * Copyright (C) 2002-2004 Oswald Buddenhagen <ossi@users.sf.net> | ||
6 | * Copyright (C) 2004 Theodore Y. Ts'o <tytso@mit.edu> | ||
7 | * Copyright (C) 2006 Mike McCormack | ||
8 | * Copyright (C) 2006 Christian Couder | ||
9 | * | ||
10 | * This program is free software; you can redistribute it and/or modify | ||
11 | * it under the terms of the GNU General Public License as published by | ||
12 | * the Free Software Foundation; either version 2 of the License, or | ||
13 | * (at your option) any later version. | ||
14 | * | ||
15 | * This program is distributed in the hope that it will be useful, | ||
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
18 | * GNU General Public License for more details. | ||
19 | * | ||
20 | * You should have received a copy of the GNU General Public License | ||
21 | * along with this program; if not, write to the Free Software | ||
22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | ||
23 | */ | ||
24 | |||
25 | #include "cache.h" | ||
26 | #include "quote.h" | ||
27 | |||
28 | /* Get a trace file descriptor from GIT_TRACE env variable. */ | ||
29 | static int get_trace_fd(int *need_close) | ||
30 | { | ||
31 | char *trace = getenv("GIT_TRACE"); | ||
32 | |||
33 | if (!trace || !strcmp(trace, "") || | ||
34 | !strcmp(trace, "0") || !strcasecmp(trace, "false")) | ||
35 | return 0; | ||
36 | if (!strcmp(trace, "1") || !strcasecmp(trace, "true")) | ||
37 | return STDERR_FILENO; | ||
38 | if (strlen(trace) == 1 && isdigit(*trace)) | ||
39 | return atoi(trace); | ||
40 | if (is_absolute_path(trace)) { | ||
41 | int fd = open(trace, O_WRONLY | O_APPEND | O_CREAT, 0666); | ||
42 | if (fd == -1) { | ||
43 | fprintf(stderr, | ||
44 | "Could not open '%s' for tracing: %s\n" | ||
45 | "Defaulting to tracing on stderr...\n", | ||
46 | trace, strerror(errno)); | ||
47 | return STDERR_FILENO; | ||
48 | } | ||
49 | *need_close = 1; | ||
50 | return fd; | ||
51 | } | ||
52 | |||
53 | fprintf(stderr, "What does '%s' for GIT_TRACE mean?\n", trace); | ||
54 | fprintf(stderr, "If you want to trace into a file, " | ||
55 | "then please set GIT_TRACE to an absolute pathname " | ||
56 | "(starting with /).\n"); | ||
57 | fprintf(stderr, "Defaulting to tracing on stderr...\n"); | ||
58 | |||
59 | return STDERR_FILENO; | ||
60 | } | ||
61 | |||
62 | static const char err_msg[] = "Could not trace into fd given by " | ||
63 | "GIT_TRACE environment variable"; | ||
64 | |||
65 | void trace_printf(const char *fmt, ...) | ||
66 | { | ||
67 | struct strbuf buf; | ||
68 | va_list ap; | ||
69 | int fd, len, need_close = 0; | ||
70 | |||
71 | fd = get_trace_fd(&need_close); | ||
72 | if (!fd) | ||
73 | return; | ||
74 | |||
75 | strbuf_init(&buf, 64); | ||
76 | va_start(ap, fmt); | ||
77 | len = vsnprintf(buf.buf, strbuf_avail(&buf), fmt, ap); | ||
78 | va_end(ap); | ||
79 | if (len >= strbuf_avail(&buf)) { | ||
80 | strbuf_grow(&buf, len - strbuf_avail(&buf) + 128); | ||
81 | va_start(ap, fmt); | ||
82 | len = vsnprintf(buf.buf, strbuf_avail(&buf), fmt, ap); | ||
83 | va_end(ap); | ||
84 | if (len >= strbuf_avail(&buf)) | ||
85 | die("broken vsnprintf"); | ||
86 | } | ||
87 | strbuf_setlen(&buf, len); | ||
88 | |||
89 | write_or_whine_pipe(fd, buf.buf, buf.len, err_msg); | ||
90 | strbuf_release(&buf); | ||
91 | |||
92 | if (need_close) | ||
93 | close(fd); | ||
94 | } | ||
95 | |||
96 | void trace_argv_printf(const char **argv, const char *fmt, ...) | ||
97 | { | ||
98 | struct strbuf buf; | ||
99 | va_list ap; | ||
100 | int fd, len, need_close = 0; | ||
101 | |||
102 | fd = get_trace_fd(&need_close); | ||
103 | if (!fd) | ||
104 | return; | ||
105 | |||
106 | strbuf_init(&buf, 64); | ||
107 | va_start(ap, fmt); | ||
108 | len = vsnprintf(buf.buf, strbuf_avail(&buf), fmt, ap); | ||
109 | va_end(ap); | ||
110 | if (len >= strbuf_avail(&buf)) { | ||
111 | strbuf_grow(&buf, len - strbuf_avail(&buf) + 128); | ||
112 | va_start(ap, fmt); | ||
113 | len = vsnprintf(buf.buf, strbuf_avail(&buf), fmt, ap); | ||
114 | va_end(ap); | ||
115 | if (len >= strbuf_avail(&buf)) | ||
116 | die("broken vsnprintf"); | ||
117 | } | ||
118 | strbuf_setlen(&buf, len); | ||
119 | |||
120 | sq_quote_argv(&buf, argv, 0); | ||
121 | strbuf_addch(&buf, '\n'); | ||
122 | write_or_whine_pipe(fd, buf.buf, buf.len, err_msg); | ||
123 | strbuf_release(&buf); | ||
124 | |||
125 | if (need_close) | ||
126 | close(fd); | ||
127 | } | ||