Merge branch 'jc/subdir'
[git/gitweb.git] / trace.c
blob27fef868c4e2276638873cbda7d353cf4b8f67ed
1 /*
2 * GIT - The information manager from hell
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
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.
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.
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
25 #include "cache.h"
26 #include "quote.h"
28 /* Stolen from "imap-send.c". */
29 static int git_vasprintf(char **strp, const char *fmt, va_list ap)
31 int len;
32 char tmp[1024];
34 if ((len = vsnprintf(tmp, sizeof(tmp), fmt, ap)) < 0 ||
35 !(*strp = xmalloc(len + 1)))
36 return -1;
37 if (len >= (int)sizeof(tmp))
38 vsprintf(*strp, fmt, ap);
39 else
40 memcpy(*strp, tmp, len + 1);
41 return len;
44 /* Stolen from "imap-send.c". */
45 int nfvasprintf(char **str, const char *fmt, va_list va)
47 int ret = git_vasprintf(str, fmt, va);
48 if (ret < 0)
49 die("Fatal: Out of memory\n");
50 return ret;
53 /* Get a trace file descriptor from GIT_TRACE env variable. */
54 static int get_trace_fd(int *need_close)
56 char *trace = getenv("GIT_TRACE");
58 if (!trace || !strcmp(trace, "") ||
59 !strcmp(trace, "0") || !strcasecmp(trace, "false"))
60 return 0;
61 if (!strcmp(trace, "1") || !strcasecmp(trace, "true"))
62 return STDERR_FILENO;
63 if (strlen(trace) == 1 && isdigit(*trace))
64 return atoi(trace);
65 if (*trace == '/') {
66 int fd = open(trace, O_WRONLY | O_APPEND | O_CREAT, 0666);
67 if (fd == -1) {
68 fprintf(stderr,
69 "Could not open '%s' for tracing: %s\n"
70 "Defaulting to tracing on stderr...\n",
71 trace, strerror(errno));
72 return STDERR_FILENO;
74 *need_close = 1;
75 return fd;
78 fprintf(stderr, "What does '%s' for GIT_TRACE means ?\n", trace);
79 fprintf(stderr, "If you want to trace into a file, "
80 "then please set GIT_TRACE to an absolute pathname "
81 "(starting with /).\n");
82 fprintf(stderr, "Defaulting to tracing on stderr...\n");
84 return STDERR_FILENO;
87 static const char err_msg[] = "Could not trace into fd given by "
88 "GIT_TRACE environment variable";
90 void trace_printf(const char *format, ...)
92 char *trace_str;
93 va_list rest;
94 int need_close = 0;
95 int fd = get_trace_fd(&need_close);
97 if (!fd)
98 return;
100 va_start(rest, format);
101 nfvasprintf(&trace_str, format, rest);
102 va_end(rest);
104 write_or_whine_pipe(fd, trace_str, strlen(trace_str), err_msg);
106 free(trace_str);
108 if (need_close)
109 close(fd);
112 void trace_argv_printf(const char **argv, int count, const char *format, ...)
114 char *argv_str, *format_str, *trace_str;
115 size_t argv_len, format_len, trace_len;
116 va_list rest;
117 int need_close = 0;
118 int fd = get_trace_fd(&need_close);
120 if (!fd)
121 return;
123 /* Get the argv string. */
124 argv_str = sq_quote_argv(argv, count);
125 argv_len = strlen(argv_str);
127 /* Get the formated string. */
128 va_start(rest, format);
129 nfvasprintf(&format_str, format, rest);
130 va_end(rest);
132 /* Allocate buffer for trace string. */
133 format_len = strlen(format_str);
134 trace_len = argv_len + format_len + 1; /* + 1 for \n */
135 trace_str = xmalloc(trace_len + 1);
137 /* Copy everything into the trace string. */
138 strncpy(trace_str, format_str, format_len);
139 strncpy(trace_str + format_len, argv_str, argv_len);
140 strcpy(trace_str + trace_len - 1, "\n");
142 write_or_whine_pipe(fd, trace_str, trace_len, err_msg);
144 free(argv_str);
145 free(format_str);
146 free(trace_str);
148 if (need_close)
149 close(fd);