*
* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
*
- * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
-
-#include <stdio.h>
-#include <errno.h>
-#include <string.h>
-#include <stdlib.h>
-#include <syslog.h>
#include "libbb.h"
+#if ENABLE_FEATURE_SYSLOG
+# include <syslog.h>
+#endif
-int logmode = LOGMODE_STDIO;
+#if ENABLE_FEATURE_SYSLOG
+static smallint syslog_level = LOG_ERR;
+#endif
+smallint logmode = LOGMODE_STDIO;
+const char *msg_eol = "\n";
-void bb_verror_msg(const char *s, va_list p, const char* strerr)
+void FAST_FUNC bb_verror_msg(const char *s, va_list p, const char* strerr)
{
- /* va_copy is used because it is not portable
- * to use va_list p twice */
- va_list p2;
- va_copy(p2, p);
+ char *msg, *msg1;
+ char stack_msg[80];
+ int applet_len, strerr_len, msgeol_len, used;
- if (logmode & LOGMODE_STDIO) {
- fflush(stdout);
- fprintf(stderr, "%s: ", bb_applet_name);
- vfprintf(stderr, s, p);
- if (!strerr)
- fputc('\n', stderr);
- else
- fprintf(stderr, ": %s\n", strerr);
+ 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;
}
- if (ENABLE_FEATURE_SYSLOG & (logmode & LOGMODE_SYSLOG)) {
- if (!strerr)
- vsyslog(LOG_ERR, s, p2);
- else {
- char *msg;
- if (vasprintf(&msg, s, p2) < 0)
- bb_error_msg_and_die(bb_msg_memory_exhausted);
- syslog(LOG_ERR, "%s: %s", msg, strerr);
- free(msg);
+
+ 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);
}
- va_end(p2);
+# if ENABLE_FEATURE_SYSLOG
+ if (logmode & LOGMODE_SYSLOG) {
+ syslog(syslog_level, "%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);
+}
+
+#if ENABLE_FEATURE_SYSLOG_INFO
+void FAST_FUNC bb_vinfo_msg(const char *s, va_list p)
+{
+ syslog_level = LOG_INFO;
+ bb_verror_msg(s, p, NULL);
+ syslog_level = LOG_ERR;
+}
+
+void FAST_FUNC bb_info_msg(const char *s, ...)
+{
+ va_list p;
+
+ va_start(p, s);
+ bb_vinfo_msg(s, p);
+ va_end(p);
+}
+
+void FAST_FUNC bb_simple_info_msg(const char *s)
+{
+ bb_info_msg("%s", s);
+}
+#endif
+
+void FAST_FUNC bb_simple_error_msg(const char *s)
+{
+ bb_error_msg("%s", s);
+}
+
+void FAST_FUNC bb_simple_error_msg_and_die(const char *s)
+{
+ bb_error_msg_and_die("%s", s);
}
projects / oweals / busybox.git / blobdiff