1 /* vi: set sw=4 ts=4: */
5 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
7 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
10 #if ENABLE_FEATURE_SYSLOG
14 #if ENABLE_FEATURE_SYSLOG
15 smallint syslog_level = LOG_ERR;
17 smallint logmode = LOGMODE_STDIO;
18 const char *msg_eol = "\n";
20 void FAST_FUNC bb_verror_msg(const char *s, va_list p, const char* strerr)
24 int applet_len, strerr_len, msgeol_len, used;
29 if (!s) /* nomsg[_and_die] uses NULL fmt */
30 s = ""; /* some libc don't like printf(NULL) */
32 applet_len = strlen(applet_name) + 2; /* "applet: " */
33 strerr_len = strerr ? strlen(strerr) : 0;
34 msgeol_len = strlen(msg_eol);
36 /* This costs ~90 bytes of code, but avoids costly
37 * malloc()[in vasprintf]+realloc()+memmove()+free() in 99% of cases.
40 if ((int)sizeof(stack_msg) - applet_len > 0) {
43 /* It is not portable to use va_list twice, need to va_copy it */
45 used = vsnprintf(stack_msg + applet_len, (int)sizeof(stack_msg) - applet_len, s, p2);
49 if (used < (int)sizeof(stack_msg) - 3 - msgeol_len - strerr_len)
53 used = vasprintf(&msg, s, p);
57 /* This is ugly and costs +60 bytes compared to multiple
58 * fprintf's, but is guaranteed to do a single write.
59 * This is needed for e.g. httpd logging, when multiple
60 * children can produce log messages simultaneously. */
62 /* can't use xrealloc: it calls error_msg on failure,
63 * that may result in a recursion */
64 /* +3 is for ": " before strerr and for terminating NUL */
65 msg1 = realloc(msg, applet_len + used + strerr_len + msgeol_len + 3);
67 msg[used++] = '\n'; /* overwrites NUL */
71 /* TODO: maybe use writev instead of memmoving? Need full_writev? */
72 memmove(msg + applet_len, msg, used);
75 strcpy(msg, applet_name);
76 msg[applet_len - 2] = ':';
77 msg[applet_len - 1] = ' ';
79 if (s[0]) { /* not perror_nomsg? */
83 strcpy(&msg[used], strerr);
86 strcpy(&msg[used], msg_eol);
90 if (logmode & LOGMODE_STDIO) {
92 full_write(STDERR_FILENO, msg, used);
94 #if ENABLE_FEATURE_SYSLOG
95 if (logmode & LOGMODE_SYSLOG) {
96 syslog(syslog_level, "%s", msg + applet_len);
103 #ifdef VERSION_WITH_WRITEV
104 /* Code size is approximately the same, but currently it's the only user
105 * of writev in entire bbox. __libc_writev in uclibc is ~50 bytes. */
106 void FAST_FUNC bb_verror_msg(const char *s, va_list p, const char* strerr)
108 int strerr_len, msgeol_len;
111 #define used (iov[2].iov_len)
112 #define msgv (iov[2].iov_base)
113 #define msgc ((char*)(iov[2].iov_base))
114 #define msgptr (&(iov[2].iov_base))
119 if (!s) /* nomsg[_and_die] uses NULL fmt */
120 s = ""; /* some libc don't like printf(NULL) */
122 /* Prevent "derefing type-punned ptr will break aliasing rules" */
123 used = vasprintf((char**)(void*)msgptr, s, p);
127 /* This is ugly and costs +60 bytes compared to multiple
128 * fprintf's, but is guaranteed to do a single write.
129 * This is needed for e.g. httpd logging, when multiple
130 * children can produce log messages simultaneously. */
132 strerr_len = strerr ? strlen(strerr) : 0;
133 msgeol_len = strlen(msg_eol);
134 /* +3 is for ": " before strerr and for terminating NUL */
135 msgv = xrealloc(msgv, used + strerr_len + msgeol_len + 3);
139 strcpy(msgc + used, strerr);
142 strcpy(msgc + used, msg_eol);
145 if (logmode & LOGMODE_STDIO) {
146 iov[0].iov_base = (char*)applet_name;
147 iov[0].iov_len = strlen(applet_name);
148 iov[1].iov_base = (char*)": ";
150 /*iov[2].iov_base = msgc;*/
151 /*iov[2].iov_len = used;*/
153 writev(STDERR_FILENO, iov, 3);
155 # if ENABLE_FEATURE_SYSLOG
156 if (logmode & LOGMODE_SYSLOG) {
157 syslog(LOG_ERR, "%s", msgc);
165 void FAST_FUNC bb_error_msg_and_die(const char *s, ...)
170 bb_verror_msg(s, p, NULL);
175 void FAST_FUNC bb_error_msg(const char *s, ...)
180 bb_verror_msg(s, p, NULL);