Make write_sha1_file_prepare() static
[git/git.git] / trace.c
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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/* Stolen from "imap-send.c". */
29static int git_vasprintf(char **strp, const char *fmt, va_list ap)
30{
31 int len;
32 char tmp[1024];
33
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;
42}
43
44/* Stolen from "imap-send.c". */
45int nfvasprintf(char **str, const char *fmt, va_list va)
46{
47 int ret = git_vasprintf(str, fmt, va);
48 if (ret < 0)
49 die("Fatal: Out of memory\n");
50 return ret;
51}
52
53/* Get a trace file descriptor from GIT_TRACE env variable. */
54static int get_trace_fd(int *need_close)
55{
56 char *trace = getenv("GIT_TRACE");
57
6d248923 58 if (!trace || !strcmp(trace, "0") || !strcasecmp(trace, "false"))
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59 return 0;
60 if (!strcmp(trace, "1") || !strcasecmp(trace, "true"))
61 return STDERR_FILENO;
62 if (strlen(trace) == 1 && isdigit(*trace))
63 return atoi(trace);
64 if (*trace == '/') {
65 int fd = open(trace, O_WRONLY | O_APPEND | O_CREAT, 0666);
66 if (fd == -1) {
67 fprintf(stderr,
68 "Could not open '%s' for tracing: %s\n"
69 "Defaulting to tracing on stderr...\n",
70 trace, strerror(errno));
71 return STDERR_FILENO;
72 }
73 *need_close = 1;
74 return fd;
75 }
76
77 fprintf(stderr, "What does '%s' for GIT_TRACE means ?\n", trace);
78 fprintf(stderr, "If you want to trace into a file, "
79 "then please set GIT_TRACE to an absolute pathname "
80 "(starting with /).\n");
81 fprintf(stderr, "Defaulting to tracing on stderr...\n");
82
83 return STDERR_FILENO;
84}
85
86static const char err_msg[] = "Could not trace into fd given by "
87 "GIT_TRACE environment variable";
88
89void trace_printf(const char *format, ...)
90{
91 char *trace_str;
92 va_list rest;
93 int need_close = 0;
94 int fd = get_trace_fd(&need_close);
95
96 if (!fd)
97 return;
98
99 va_start(rest, format);
100 nfvasprintf(&trace_str, format, rest);
101 va_end(rest);
102
103 write_or_whine(fd, trace_str, strlen(trace_str), err_msg);
104
105 free(trace_str);
106
107 if (need_close)
108 close(fd);
109}
110
111void trace_argv_printf(const char **argv, int count, const char *format, ...)
112{
113 char *argv_str, *format_str, *trace_str;
114 size_t argv_len, format_len, trace_len;
115 va_list rest;
116 int need_close = 0;
117 int fd = get_trace_fd(&need_close);
118
119 if (!fd)
120 return;
121
122 /* Get the argv string. */
123 argv_str = sq_quote_argv(argv, count);
124 argv_len = strlen(argv_str);
125
126 /* Get the formated string. */
127 va_start(rest, format);
128 nfvasprintf(&format_str, format, rest);
129 va_end(rest);
130
131 /* Allocate buffer for trace string. */
132 format_len = strlen(format_str);
133 trace_len = argv_len + format_len + 1; /* + 1 for \n */
134 trace_str = xmalloc(trace_len + 1);
135
136 /* Copy everything into the trace string. */
137 strncpy(trace_str, format_str, format_len);
138 strncpy(trace_str + format_len, argv_str, argv_len);
139 strcpy(trace_str + trace_len - 1, "\n");
140
141 write_or_whine(fd, trace_str, trace_len, err_msg);
142
143 free(argv_str);
144 free(format_str);
145 free(trace_str);
146
147 if (need_close)
148 close(fd);
149}