162 lines
3.9 KiB
C
162 lines
3.9 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Utility routines.
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*
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* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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*
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* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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*/
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#include "libbb.h"
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#if ENABLE_FEATURE_SYSLOG
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# include <syslog.h>
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#endif
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#if ENABLE_FEATURE_SYSLOG
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smallint syslog_level = LOG_ERR;
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#endif
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smallint logmode = LOGMODE_STDIO;
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const char *msg_eol = "\n";
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void FAST_FUNC bb_verror_msg(const char *s, va_list p, const char* strerr)
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{
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char *msg, *msg1;
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int applet_len, strerr_len, msgeol_len, used;
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if (!logmode)
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return;
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if (!s) /* nomsg[_and_die] uses NULL fmt */
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s = ""; /* some libc don't like printf(NULL) */
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used = vasprintf(&msg, s, p);
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if (used < 0)
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return;
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/* This is ugly and costs +60 bytes compared to multiple
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* fprintf's, but is guaranteed to do a single write.
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* This is needed for e.g. httpd logging, when multiple
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* children can produce log messages simultaneously. */
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applet_len = strlen(applet_name) + 2; /* "applet: " */
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strerr_len = strerr ? strlen(strerr) : 0;
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msgeol_len = strlen(msg_eol);
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/* can't use xrealloc: it calls error_msg on failure,
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* that may result in a recursion */
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/* +3 is for ": " before strerr and for terminating NUL */
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msg1 = realloc(msg, applet_len + used + strerr_len + msgeol_len + 3);
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if (!msg1) {
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msg[used++] = '\n'; /* overwrites NUL */
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applet_len = 0;
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} else {
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msg = msg1;
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/* TODO: maybe use writev instead of memmoving? Need full_writev? */
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memmove(msg + applet_len, msg, used);
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used += applet_len;
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strcpy(msg, applet_name);
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msg[applet_len - 2] = ':';
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msg[applet_len - 1] = ' ';
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if (strerr) {
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if (s[0]) { /* not perror_nomsg? */
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msg[used++] = ':';
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msg[used++] = ' ';
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}
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strcpy(&msg[used], strerr);
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used += strerr_len;
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}
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strcpy(&msg[used], msg_eol);
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used += msgeol_len;
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}
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if (logmode & LOGMODE_STDIO) {
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fflush_all();
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full_write(STDERR_FILENO, msg, used);
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}
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#if ENABLE_FEATURE_SYSLOG
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if (logmode & LOGMODE_SYSLOG) {
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syslog(syslog_level, "%s", msg + applet_len);
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}
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#endif
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free(msg);
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}
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#ifdef VERSION_WITH_WRITEV
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/* Code size is approximately the same, but currently it's the only user
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* of writev in entire bbox. __libc_writev in uclibc is ~50 bytes. */
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void FAST_FUNC bb_verror_msg(const char *s, va_list p, const char* strerr)
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{
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int strerr_len, msgeol_len;
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struct iovec iov[3];
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#define used (iov[2].iov_len)
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#define msgv (iov[2].iov_base)
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#define msgc ((char*)(iov[2].iov_base))
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#define msgptr (&(iov[2].iov_base))
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if (!logmode)
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return;
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if (!s) /* nomsg[_and_die] uses NULL fmt */
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s = ""; /* some libc don't like printf(NULL) */
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/* Prevent "derefing type-punned ptr will break aliasing rules" */
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used = vasprintf((char**)(void*)msgptr, s, p);
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if (used < 0)
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return;
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/* This is ugly and costs +60 bytes compared to multiple
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* fprintf's, but is guaranteed to do a single write.
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* This is needed for e.g. httpd logging, when multiple
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* children can produce log messages simultaneously. */
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strerr_len = strerr ? strlen(strerr) : 0;
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msgeol_len = strlen(msg_eol);
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/* +3 is for ": " before strerr and for terminating NUL */
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msgv = xrealloc(msgv, used + strerr_len + msgeol_len + 3);
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if (strerr) {
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msgc[used++] = ':';
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msgc[used++] = ' ';
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strcpy(msgc + used, strerr);
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used += strerr_len;
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}
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strcpy(msgc + used, msg_eol);
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used += msgeol_len;
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if (logmode & LOGMODE_STDIO) {
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iov[0].iov_base = (char*)applet_name;
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iov[0].iov_len = strlen(applet_name);
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iov[1].iov_base = (char*)": ";
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iov[1].iov_len = 2;
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/*iov[2].iov_base = msgc;*/
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/*iov[2].iov_len = used;*/
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fflush_all();
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writev(STDERR_FILENO, iov, 3);
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}
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# if ENABLE_FEATURE_SYSLOG
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if (logmode & LOGMODE_SYSLOG) {
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syslog(LOG_ERR, "%s", msgc);
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}
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# endif
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free(msgc);
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}
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#endif
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void FAST_FUNC bb_error_msg_and_die(const char *s, ...)
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{
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va_list p;
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va_start(p, s);
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bb_verror_msg(s, p, NULL);
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va_end(p);
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xfunc_die();
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}
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void FAST_FUNC bb_error_msg(const char *s, ...)
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{
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va_list p;
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va_start(p, s);
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bb_verror_msg(s, p, NULL);
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va_end(p);
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}
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