Magellan Linux

  • Back to homepage
    • /[magellan-source]/tags/mkinitrd-6_2_0/libbb/verror_msg.c

    Annotation of /tags/mkinitrd-6_2_0/libbb/verror_msg.c

    Parent Directory Parent Directory | Revision Log Revision Log

    Revision 984 - (hide annotations) (download)
    Sun May 30 11:32:42 2010 UTC (14 years, 4 months ago) by niro
    Original Path: trunk/mkinitrd-magellan/busybox/libbb/verror_msg.c
    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 niro 532 /* 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 niro 816 smallint logmode = LOGMODE_STDIO;
    14 niro 532 const char *msg_eol = "\n";
    15    
    16 niro 816 void FAST_FUNC bb_verror_msg(const char *s, va_list p, const char* strerr)
    17 niro 532 {
    18 niro 984 char *msg, *msg1;
    19 niro 816 int applet_len, strerr_len, msgeol_len, used;
    20 niro 532
    21 niro 816 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 niro 984 /* can't use xrealloc: it calls error_msg on failure,
    40     * that may result in a recursion */
    41 niro 816 /* +3 is for ": " before strerr and for terminating NUL */
    42 niro 984 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 niro 816 }
    62 niro 984 strcpy(&msg[used], msg_eol);
    63     used += msgeol_len;
    64 niro 816 }
    65    
    66 niro 532 if (logmode & LOGMODE_STDIO) {
    67 niro 984 fflush_all();
    68     full_write(STDERR_FILENO, msg, used);
    69 niro 532 }
    70 niro 816 if (logmode & LOGMODE_SYSLOG) {
    71     syslog(LOG_ERR, "%s", msg + applet_len);
    72 niro 532 }
    73 niro 816 free(msg);
    74 niro 532 }
    75 niro 816
    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 niro 984 fflush_all();
    129     writev(STDERR_FILENO, iov, 3);
    130 niro 816 }
    131     if (logmode & LOGMODE_SYSLOG) {
    132     syslog(LOG_ERR, "%s", msgc);
    133     }
    134     free(msgc);
    135     }
    136     #endif