/* 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 source tree. */ #include "libbb.h" #if ENABLE_FEATURE_SYSLOG # include <syslog.h> #endif #if ENABLE_FEATURE_SYSLOG smallint syslog_level = LOG_ERR; #endif 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, *msg1; char stack_msg[80]; 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) */ applet_len = strlen(applet_name) + 2; /* "applet: " */ strerr_len = strerr ? strlen(strerr) : 0; msgeol_len = strlen(msg_eol); /* This costs ~90 bytes of code, but avoids costly * malloc()[in vasprintf]+realloc()+memmove()+free() in 99% of cases. * ~40% speedup. */ if ((int)sizeof(stack_msg) - applet_len > 0) { va_list p2; /* It is not portable to use va_list twice, need to va_copy it */ va_copy(p2, p); used = vsnprintf(stack_msg + applet_len, (int)sizeof(stack_msg) - applet_len, s, p2); va_end(p2); msg = stack_msg; used += applet_len; if (used < (int)sizeof(stack_msg) - 3 - msgeol_len - strerr_len) goto add_pfx_and_sfx; } 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. */ /* can't use xrealloc: it calls error_msg on failure, * that may result in a recursion */ /* +3 is for ": " before strerr and for terminating NUL */ msg1 = realloc(msg, applet_len + used + strerr_len + msgeol_len + 3); if (!msg1) { msg[used++] = '\n'; /* overwrites NUL */ applet_len = 0; } else { msg = msg1; /* TODO: maybe use writev instead of memmoving? Need full_writev? */ memmove(msg + applet_len, msg, used); used += applet_len; add_pfx_and_sfx: 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); used += msgeol_len; } if (logmode & LOGMODE_STDIO) { fflush_all(); full_write(STDERR_FILENO, msg, used); } #if ENABLE_FEATURE_SYSLOG if (logmode & LOGMODE_SYSLOG) { syslog(syslog_level, "%s", msg + applet_len); } #endif if (msg != stack_msg) 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_all(); writev(STDERR_FILENO, iov, 3); } # if ENABLE_FEATURE_SYSLOG if (logmode & LOGMODE_SYSLOG) { syslog(LOG_ERR, "%s", msgc); } # endif free(msgc); } #endif void FAST_FUNC bb_error_msg_and_die(const char *s, ...) { va_list p; va_start(p, s); bb_verror_msg(s, p, NULL); va_end(p); xfunc_die(); } void FAST_FUNC bb_error_msg(const char *s, ...) { va_list p; va_start(p, s); bb_verror_msg(s, p, NULL); va_end(p); }