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6ce4e61f CC |
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". */ | |
29 | static 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". */ | |
45 | int 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. */ | |
54 | static int get_trace_fd(int *need_close) | |
55 | { | |
56 | char *trace = getenv("GIT_TRACE"); | |
57 | ||
58 | if (!trace || !strcmp(trace, "0") || !strcasecmp(trace," false")) | |
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 | ||
86 | static const char err_msg[] = "Could not trace into fd given by " | |
87 | "GIT_TRACE environment variable"; | |
88 | ||
89 | void 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 | ||
111 | void 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 | } |