Magellan Linux

  • Back to homepage
    • /[magellan-source]/trunk/mkinitrd-magellan/busybox/libbb/verror_msg.c

    Contents of /trunk/mkinitrd-magellan/busybox/libbb/verror_msg.c

    Parent Directory Parent Directory | Revision Log Revision Log

    Revision 984 - (show annotations) (download)
    Sun May 30 11:32:42 2010 UTC (13 years, 11 months ago) by niro
    File MIME type: text/plain
    File size: 3607 byte(s) 
    -updated to busybox-1.16.1 and enabled blkid/uuid support in default config
    1 /* vi: set sw=4 ts=4: */
    2 /*
    3 * Utility routines.
    4 *
    5 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
    6 *
    7 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
    8 */
    9
    10 #include "libbb.h"
    11 #include <syslog.h>
    12
    13 smallint logmode = LOGMODE_STDIO;
    14 const char *msg_eol = "\n";
    15
    16 void FAST_FUNC bb_verror_msg(const char *s, va_list p, const char* strerr)
    17 {
    18 char *msg, *msg1;
    19 int applet_len, strerr_len, msgeol_len, used;
    20
    21 if (!logmode)
    22 return;
    23
    24 if (!s) /* nomsg[_and_die] uses NULL fmt */
    25 s = ""; /* some libc don't like printf(NULL) */
    26
    27 used = vasprintf(&msg, s, p);
    28 if (used < 0)
    29 return;
    30
    31 /* This is ugly and costs +60 bytes compared to multiple
    32 * fprintf's, but is guaranteed to do a single write.
    33 * This is needed for e.g. httpd logging, when multiple
    34 * children can produce log messages simultaneously. */
    35
    36 applet_len = strlen(applet_name) + 2; /* "applet: " */
    37 strerr_len = strerr ? strlen(strerr) : 0;
    38 msgeol_len = strlen(msg_eol);
    39 /* can't use xrealloc: it calls error_msg on failure,
    40 * that may result in a recursion */
    41 /* +3 is for ": " before strerr and for terminating NUL */
    42 msg1 = realloc(msg, applet_len + used + strerr_len + msgeol_len + 3);
    43 if (!msg1) {
    44 msg[used++] = '\n'; /* overwrites NUL */
    45 applet_len = 0;
    46 } else {
    47 msg = msg1;
    48 /* TODO: maybe use writev instead of memmoving? Need full_writev? */
    49 memmove(msg + applet_len, msg, used);
    50 used += applet_len;
    51 strcpy(msg, applet_name);
    52 msg[applet_len - 2] = ':';
    53 msg[applet_len - 1] = ' ';
    54 if (strerr) {
    55 if (s[0]) { /* not perror_nomsg? */
    56 msg[used++] = ':';
    57 msg[used++] = ' ';
    58 }
    59 strcpy(&msg[used], strerr);
    60 used += strerr_len;
    61 }
    62 strcpy(&msg[used], msg_eol);
    63 used += msgeol_len;
    64 }
    65
    66 if (logmode & LOGMODE_STDIO) {
    67 fflush_all();
    68 full_write(STDERR_FILENO, msg, used);
    69 }
    70 if (logmode & LOGMODE_SYSLOG) {
    71 syslog(LOG_ERR, "%s", msg + applet_len);
    72 }
    73 free(msg);
    74 }
    75
    76
    77 #ifdef VERSION_WITH_WRITEV
    78
    79 /* Code size is approximately the same, but currently it's the only user
    80 * of writev in entire bbox. __libc_writev in uclibc is ~50 bytes. */
    81
    82 void FAST_FUNC bb_verror_msg(const char *s, va_list p, const char* strerr)
    83 {
    84 int strerr_len, msgeol_len;
    85 struct iovec iov[3];
    86
    87 #define used (iov[2].iov_len)
    88 #define msgv (iov[2].iov_base)
    89 #define msgc ((char*)(iov[2].iov_base))
    90 #define msgptr (&(iov[2].iov_base))
    91
    92 if (!logmode)
    93 return;
    94
    95 if (!s) /* nomsg[_and_die] uses NULL fmt */
    96 s = ""; /* some libc don't like printf(NULL) */
    97
    98 /* Prevent "derefing type-punned ptr will break aliasing rules" */
    99 used = vasprintf((char**)(void*)msgptr, s, p);
    100 if (used < 0)
    101 return;
    102
    103 /* This is ugly and costs +60 bytes compared to multiple
    104 * fprintf's, but is guaranteed to do a single write.
    105 * This is needed for e.g. httpd logging, when multiple
    106 * children can produce log messages simultaneously. */
    107
    108 strerr_len = strerr ? strlen(strerr) : 0;
    109 msgeol_len = strlen(msg_eol);
    110 /* +3 is for ": " before strerr and for terminating NUL */
    111 msgv = xrealloc(msgv, used + strerr_len + msgeol_len + 3);
    112 if (strerr) {
    113 msgc[used++] = ':';
    114 msgc[used++] = ' ';
    115 strcpy(msgc + used, strerr);
    116 used += strerr_len;
    117 }
    118 strcpy(msgc + used, msg_eol);
    119 used += msgeol_len;
    120
    121 if (logmode & LOGMODE_STDIO) {
    122 iov[0].iov_base = (char*)applet_name;
    123 iov[0].iov_len = strlen(applet_name);
    124 iov[1].iov_base = (char*)": ";
    125 iov[1].iov_len = 2;
    126 /*iov[2].iov_base = msgc;*/
    127 /*iov[2].iov_len = used;*/
    128 fflush_all();
    129 writev(STDERR_FILENO, iov, 3);
    130 }
    131 if (logmode & LOGMODE_SYSLOG) {
    132 syslog(LOG_ERR, "%s", msgc);
    133 }
    134 free(msgc);
    135 }
    136 #endif