[821] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Utility routines.
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| 4 | *
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| 5 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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| 6 | *
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| 7 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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| 8 | */
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| 9 |
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[1770] | 10 | #include <syslog.h>
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[821] | 11 | #include "libbb.h"
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| 12 |
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[1770] | 13 | smallint logmode = LOGMODE_STDIO;
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| 14 | const char *msg_eol = "\n";
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| 15 |
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| 16 | void bb_verror_msg(const char *s, va_list p, const char* strerr)
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[821] | 17 | {
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[1770] | 18 | char *msg;
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| 19 | int applet_len, strerr_len, msgeol_len, used;
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| 20 |
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| 21 | if (!logmode)
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| 22 | return;
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| 23 |
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| 24 | if (!s) /* nomsg[_and_die] uses NULL fmt */
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| 25 | s = ""; /* some libc don't like printf(NULL) */
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| 26 |
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| 27 | used = vasprintf(&msg, s, p);
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| 28 | if (used < 0)
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| 29 | return;
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| 30 |
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| 31 | /* This is ugly and costs +60 bytes compared to multiple
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| 32 | * fprintf's, but is guaranteed to do a single write.
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| 33 | * This is needed for e.g. httpd logging, when multiple
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| 34 | * children can produce log messages simultaneously. */
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| 35 |
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| 36 | applet_len = strlen(applet_name) + 2; /* "applet: " */
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| 37 | strerr_len = strerr ? strlen(strerr) : 0;
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| 38 | msgeol_len = strlen(msg_eol);
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| 39 | /* +3 is for ": " before strerr and for terminating NUL */
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| 40 | msg = xrealloc(msg, applet_len + used + strerr_len + msgeol_len + 3);
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| 41 | /* TODO: maybe use writev instead of memmoving? Need full_writev? */
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| 42 | memmove(msg + applet_len, msg, used);
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| 43 | used += applet_len;
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| 44 | strcpy(msg, applet_name);
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| 45 | msg[applet_len - 2] = ':';
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| 46 | msg[applet_len - 1] = ' ';
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| 47 | if (strerr) {
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| 48 | msg[used++] = ':';
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| 49 | msg[used++] = ' ';
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| 50 | strcpy(&msg[used], strerr);
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| 51 | used += strerr_len;
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| 52 | }
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| 53 | strcpy(&msg[used], msg_eol);
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| 54 |
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| 55 | if (logmode & LOGMODE_STDIO) {
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| 56 | fflush(stdout);
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| 57 | full_write(2, msg, used + msgeol_len);
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| 58 | }
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| 59 | if (logmode & LOGMODE_SYSLOG) {
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| 60 | syslog(LOG_ERR, "%s", msg + applet_len);
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| 61 | }
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| 62 | free(msg);
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[821] | 63 | }
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[1770] | 64 |
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| 65 |
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| 66 | #ifdef VERSION_WITH_WRITEV
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| 67 |
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| 68 | /* Code size is approximately the same, but currently it's the only user
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| 69 | * of writev in entire bbox. __libc_writev in uclibc is ~50 bytes. */
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| 70 |
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| 71 | void bb_verror_msg(const char *s, va_list p, const char* strerr)
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| 72 | {
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| 73 | int strerr_len, msgeol_len;
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| 74 | struct iovec iov[3];
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| 75 |
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| 76 | #define used (iov[2].iov_len)
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| 77 | #define msgv (iov[2].iov_base)
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| 78 | #define msgc ((char*)(iov[2].iov_base))
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| 79 | #define msgptr (&(iov[2].iov_base))
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| 80 |
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| 81 | if (!logmode)
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| 82 | return;
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| 83 |
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| 84 | if (!s) /* nomsg[_and_die] uses NULL fmt */
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| 85 | s = ""; /* some libc don't like printf(NULL) */
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| 86 |
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| 87 | /* Prevent "derefing type-punned ptr will break aliasing rules" */
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| 88 | used = vasprintf((char**)(void*)msgptr, s, p);
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| 89 | if (used < 0)
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| 90 | return;
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| 91 |
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| 92 | /* This is ugly and costs +60 bytes compared to multiple
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| 93 | * fprintf's, but is guaranteed to do a single write.
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| 94 | * This is needed for e.g. httpd logging, when multiple
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| 95 | * children can produce log messages simultaneously. */
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| 96 |
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| 97 | strerr_len = strerr ? strlen(strerr) : 0;
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| 98 | msgeol_len = strlen(msg_eol);
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| 99 | /* +3 is for ": " before strerr and for terminating NUL */
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| 100 | msgv = xrealloc(msgv, used + strerr_len + msgeol_len + 3);
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| 101 | if (strerr) {
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| 102 | msgc[used++] = ':';
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| 103 | msgc[used++] = ' ';
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| 104 | strcpy(msgc + used, strerr);
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| 105 | used += strerr_len;
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| 106 | }
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| 107 | strcpy(msgc + used, msg_eol);
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| 108 | used += msgeol_len;
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| 109 |
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| 110 | if (logmode & LOGMODE_STDIO) {
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| 111 | iov[0].iov_base = (char*)applet_name;
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| 112 | iov[0].iov_len = strlen(applet_name);
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| 113 | iov[1].iov_base = (char*)": ";
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| 114 | iov[1].iov_len = 2;
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| 115 | /*iov[2].iov_base = msgc;*/
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| 116 | /*iov[2].iov_len = used;*/
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| 117 | fflush(stdout);
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| 118 | writev(2, iov, 3);
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| 119 | }
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| 120 | if (logmode & LOGMODE_SYSLOG) {
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| 121 | syslog(LOG_ERR, "%s", msgc);
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| 122 | }
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| 123 | free(msgc);
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| 124 | }
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| 125 | #endif
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