Contents of /tags/mkinitrd-6_3_0/busybox/libbb/verror_msg.c
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Thu Aug 19 10:14:02 2010 UTC (14 years, 1 month ago) by niro
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File size: 3974 byte(s)
Thu Aug 19 10:14:02 2010 UTC (14 years, 1 month ago) by niro
File MIME type: text/plain
File size: 3974 byte(s)
tagged 'mkinitrd-6_3_0'
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * Utility routines. |
4 | * |
5 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org> |
6 | * |
7 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. |
8 | */ |
9 | #include "libbb.h" |
10 | #if ENABLE_FEATURE_SYSLOG |
11 | # include <syslog.h> |
12 | #endif |
13 | |
14 | smallint logmode = LOGMODE_STDIO; |
15 | const char *msg_eol = "\n"; |
16 | |
17 | void FAST_FUNC bb_verror_msg(const char *s, va_list p, const char* strerr) |
18 | { |
19 | char *msg, *msg1; |
20 | int applet_len, strerr_len, msgeol_len, used; |
21 | |
22 | if (!logmode) |
23 | return; |
24 | |
25 | if (!s) /* nomsg[_and_die] uses NULL fmt */ |
26 | s = ""; /* some libc don't like printf(NULL) */ |
27 | |
28 | used = vasprintf(&msg, s, p); |
29 | if (used < 0) |
30 | return; |
31 | |
32 | /* This is ugly and costs +60 bytes compared to multiple |
33 | * fprintf's, but is guaranteed to do a single write. |
34 | * This is needed for e.g. httpd logging, when multiple |
35 | * children can produce log messages simultaneously. */ |
36 | |
37 | applet_len = strlen(applet_name) + 2; /* "applet: " */ |
38 | strerr_len = strerr ? strlen(strerr) : 0; |
39 | msgeol_len = strlen(msg_eol); |
40 | /* can't use xrealloc: it calls error_msg on failure, |
41 | * that may result in a recursion */ |
42 | /* +3 is for ": " before strerr and for terminating NUL */ |
43 | msg1 = realloc(msg, applet_len + used + strerr_len + msgeol_len + 3); |
44 | if (!msg1) { |
45 | msg[used++] = '\n'; /* overwrites NUL */ |
46 | applet_len = 0; |
47 | } else { |
48 | msg = msg1; |
49 | /* TODO: maybe use writev instead of memmoving? Need full_writev? */ |
50 | memmove(msg + applet_len, msg, used); |
51 | used += applet_len; |
52 | strcpy(msg, applet_name); |
53 | msg[applet_len - 2] = ':'; |
54 | msg[applet_len - 1] = ' '; |
55 | if (strerr) { |
56 | if (s[0]) { /* not perror_nomsg? */ |
57 | msg[used++] = ':'; |
58 | msg[used++] = ' '; |
59 | } |
60 | strcpy(&msg[used], strerr); |
61 | used += strerr_len; |
62 | } |
63 | strcpy(&msg[used], msg_eol); |
64 | used += msgeol_len; |
65 | } |
66 | |
67 | if (logmode & LOGMODE_STDIO) { |
68 | fflush_all(); |
69 | full_write(STDERR_FILENO, msg, used); |
70 | } |
71 | #if ENABLE_FEATURE_SYSLOG |
72 | if (logmode & LOGMODE_SYSLOG) { |
73 | syslog(LOG_ERR, "%s", msg + applet_len); |
74 | } |
75 | #endif |
76 | free(msg); |
77 | } |
78 | |
79 | #ifdef VERSION_WITH_WRITEV |
80 | /* Code size is approximately the same, but currently it's the only user |
81 | * of writev in entire bbox. __libc_writev in uclibc is ~50 bytes. */ |
82 | void FAST_FUNC bb_verror_msg(const char *s, va_list p, const char* strerr) |
83 | { |
84 | int strerr_len, msgeol_len; |
85 | struct iovec iov[3]; |
86 | |
87 | #define used (iov[2].iov_len) |
88 | #define msgv (iov[2].iov_base) |
89 | #define msgc ((char*)(iov[2].iov_base)) |
90 | #define msgptr (&(iov[2].iov_base)) |
91 | |
92 | if (!logmode) |
93 | return; |
94 | |
95 | if (!s) /* nomsg[_and_die] uses NULL fmt */ |
96 | s = ""; /* some libc don't like printf(NULL) */ |
97 | |
98 | /* Prevent "derefing type-punned ptr will break aliasing rules" */ |
99 | used = vasprintf((char**)(void*)msgptr, s, p); |
100 | if (used < 0) |
101 | return; |
102 | |
103 | /* This is ugly and costs +60 bytes compared to multiple |
104 | * fprintf's, but is guaranteed to do a single write. |
105 | * This is needed for e.g. httpd logging, when multiple |
106 | * children can produce log messages simultaneously. */ |
107 | |
108 | strerr_len = strerr ? strlen(strerr) : 0; |
109 | msgeol_len = strlen(msg_eol); |
110 | /* +3 is for ": " before strerr and for terminating NUL */ |
111 | msgv = xrealloc(msgv, used + strerr_len + msgeol_len + 3); |
112 | if (strerr) { |
113 | msgc[used++] = ':'; |
114 | msgc[used++] = ' '; |
115 | strcpy(msgc + used, strerr); |
116 | used += strerr_len; |
117 | } |
118 | strcpy(msgc + used, msg_eol); |
119 | used += msgeol_len; |
120 | |
121 | if (logmode & LOGMODE_STDIO) { |
122 | iov[0].iov_base = (char*)applet_name; |
123 | iov[0].iov_len = strlen(applet_name); |
124 | iov[1].iov_base = (char*)": "; |
125 | iov[1].iov_len = 2; |
126 | /*iov[2].iov_base = msgc;*/ |
127 | /*iov[2].iov_len = used;*/ |
128 | fflush_all(); |
129 | writev(STDERR_FILENO, iov, 3); |
130 | } |
131 | # if ENABLE_FEATURE_SYSLOG |
132 | if (logmode & LOGMODE_SYSLOG) { |
133 | syslog(LOG_ERR, "%s", msgc); |
134 | } |
135 | # endif |
136 | free(msgc); |
137 | } |
138 | #endif |
139 | |
140 | |
141 | void FAST_FUNC bb_error_msg_and_die(const char *s, ...) |
142 | { |
143 | va_list p; |
144 | |
145 | va_start(p, s); |
146 | bb_verror_msg(s, p, NULL); |
147 | va_end(p); |
148 | xfunc_die(); |
149 | } |
150 | |
151 | void FAST_FUNC bb_error_msg(const char *s, ...) |
152 | { |
153 | va_list p; |
154 | |
155 | va_start(p, s); |
156 | bb_verror_msg(s, p, NULL); |
157 | va_end(p); |
158 | } |