git-send-email: Add --thread option
[git/aroben.git] / trace.c
blob7961a27a2ed4f32c766dabdf12c4115c3d3b36ba
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 int nfvasprintf(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 die("Fatal: Out of memory\n");
37 if (len >= (int)sizeof(tmp))
38 vsprintf(*strp, fmt, ap);
39 else
40 memcpy(*strp, tmp, len + 1);
41 return len;
44 int nfasprintf(char **str, const char *fmt, ...)
46 int rc;
47 va_list args;
49 va_start(args, fmt);
50 rc = nfvasprintf(str, fmt, args);
51 va_end(args);
52 return rc;
55 /* Get a trace file descriptor from GIT_TRACE env variable. */
56 static int get_trace_fd(int *need_close)
58 char *trace = getenv("GIT_TRACE");
60 if (!trace || !strcmp(trace, "") ||
61 !strcmp(trace, "0") || !strcasecmp(trace, "false"))
62 return 0;
63 if (!strcmp(trace, "1") || !strcasecmp(trace, "true"))
64 return STDERR_FILENO;
65 if (strlen(trace) == 1 && isdigit(*trace))
66 return atoi(trace);
67 if (*trace == '/') {
68 int fd = open(trace, O_WRONLY | O_APPEND | O_CREAT, 0666);
69 if (fd == -1) {
70 fprintf(stderr,
71 "Could not open '%s' for tracing: %s\n"
72 "Defaulting to tracing on stderr...\n",
73 trace, strerror(errno));
74 return STDERR_FILENO;
76 *need_close = 1;
77 return fd;
80 fprintf(stderr, "What does '%s' for GIT_TRACE means ?\n", trace);
81 fprintf(stderr, "If you want to trace into a file, "
82 "then please set GIT_TRACE to an absolute pathname "
83 "(starting with /).\n");
84 fprintf(stderr, "Defaulting to tracing on stderr...\n");
86 return STDERR_FILENO;
89 static const char err_msg[] = "Could not trace into fd given by "
90 "GIT_TRACE environment variable";
92 void trace_printf(const char *format, ...)
94 char *trace_str;
95 va_list rest;
96 int need_close = 0;
97 int fd = get_trace_fd(&need_close);
99 if (!fd)
100 return;
102 va_start(rest, format);
103 nfvasprintf(&trace_str, format, rest);
104 va_end(rest);
106 write_or_whine_pipe(fd, trace_str, strlen(trace_str), err_msg);
108 free(trace_str);
110 if (need_close)
111 close(fd);
114 void trace_argv_printf(const char **argv, int count, const char *format, ...)
116 char *argv_str, *format_str, *trace_str;
117 size_t argv_len, format_len, trace_len;
118 va_list rest;
119 int need_close = 0;
120 int fd = get_trace_fd(&need_close);
122 if (!fd)
123 return;
125 /* Get the argv string. */
126 argv_str = sq_quote_argv(argv, count);
127 argv_len = strlen(argv_str);
129 /* Get the formated string. */
130 va_start(rest, format);
131 nfvasprintf(&format_str, format, rest);
132 va_end(rest);
134 /* Allocate buffer for trace string. */
135 format_len = strlen(format_str);
136 trace_len = argv_len + format_len + 1; /* + 1 for \n */
137 trace_str = xmalloc(trace_len + 1);
139 /* Copy everything into the trace string. */
140 strncpy(trace_str, format_str, format_len);
141 strncpy(trace_str + format_len, argv_str, argv_len);
142 strcpy(trace_str + trace_len - 1, "\n");
144 write_or_whine_pipe(fd, trace_str, trace_len, err_msg);
146 free(argv_str);
147 free(format_str);
148 free(trace_str);
150 if (need_close)
151 close(fd);