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