LCOV - code coverage report
Current view: top level - strace - error_prints.c (source / functions) Hit Total Coverage
Test: strace-4.18.0.129.97bbb Code Coverage Lines: 33 38 86.8 %
Date: 2017-07-31 03:46:08 Functions: 6 6 100.0 %
Legend: Lines: hit not hit | Branches: + taken - not taken # not executed Branches: 4 8 50.0 %

           Branch data     Line data    Source code
       1                 :            : /*
       2                 :            :  * Copyright (c) 1999-2017 The strace developers.
       3                 :            :  * All rights reserved.
       4                 :            :  *
       5                 :            :  * Redistribution and use in source and binary forms, with or without
       6                 :            :  * modification, are permitted provided that the following conditions
       7                 :            :  * are met:
       8                 :            :  * 1. Redistributions of source code must retain the above copyright
       9                 :            :  *    notice, this list of conditions and the following disclaimer.
      10                 :            :  * 2. Redistributions in binary form must reproduce the above copyright
      11                 :            :  *    notice, this list of conditions and the following disclaimer in the
      12                 :            :  *    documentation and/or other materials provided with the distribution.
      13                 :            :  * 3. The name of the author may not be used to endorse or promote products
      14                 :            :  *    derived from this software without specific prior written permission.
      15                 :            :  *
      16                 :            :  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
      17                 :            :  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
      18                 :            :  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
      19                 :            :  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
      20                 :            :  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
      21                 :            :  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
      22                 :            :  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
      23                 :            :  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
      24                 :            :  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
      25                 :            :  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
      26                 :            :  */
      27                 :            : 
      28                 :            : #ifdef HAVE_CONFIG_H
      29                 :            : # include "config.h"
      30                 :            : #endif
      31                 :            : 
      32                 :            : #include <errno.h>
      33                 :            : #include <stdarg.h>
      34                 :            : #include <string.h>
      35                 :            : #include <stdio.h>
      36                 :            : #include <stdlib.h>
      37                 :            : 
      38                 :            : #include "error_prints.h"
      39                 :            : 
      40                 :            : extern char *program_invocation_name;
      41                 :            : 
      42                 :            : static void
      43                 :      41943 : verror_msg(int err_no, const char *fmt, va_list p)
      44                 :            : {
      45                 :            :         char *msg;
      46                 :            : 
      47                 :      41943 :         fflush(NULL);
      48                 :            : 
      49                 :            :         /* We want to print entire message with single fprintf to ensure
      50                 :            :          * message integrity if stderr is shared with other programs.
      51                 :            :          * Thus we use vasprintf + single fprintf.
      52                 :            :          */
      53                 :      41943 :         msg = NULL;
      54         [ +  - ]:      41943 :         if (vasprintf(&msg, fmt, p) >= 0) {
      55         [ +  + ]:      41943 :                 if (err_no)
      56                 :      10106 :                         fprintf(stderr, "%s: %s: %s\n",
      57                 :            :                                 program_invocation_name, msg, strerror(err_no));
      58                 :            :                 else
      59                 :      31837 :                         fprintf(stderr, "%s: %s\n",
      60                 :            :                                 program_invocation_name, msg);
      61                 :      41943 :                 free(msg);
      62                 :            :         } else {
      63                 :            :                 /* malloc in vasprintf failed, try it without malloc */
      64                 :          0 :                 fprintf(stderr, "%s: ", program_invocation_name);
      65                 :          0 :                 vfprintf(stderr, fmt, p);
      66         [ #  # ]:          0 :                 if (err_no)
      67                 :          0 :                         fprintf(stderr, ": %s\n", strerror(err_no));
      68                 :            :                 else
      69                 :          0 :                         putc('\n', stderr);
      70                 :            :         }
      71                 :            :         /* We don't switch stderr to buffered, thus fprintf(stderr)
      72                 :            :          * always flushes its output and this is not necessary: */
      73                 :            :         /* fflush(stderr); */
      74                 :      41943 : }
      75                 :            : 
      76                 :            : void
      77                 :      31420 : error_msg(const char *fmt, ...)
      78                 :            : {
      79                 :            :         va_list p;
      80                 :      31420 :         va_start(p, fmt);
      81                 :      31420 :         verror_msg(0, fmt, p);
      82                 :      31420 :         va_end(p);
      83                 :      31420 : }
      84                 :            : 
      85                 :            : void
      86                 :        387 : error_msg_and_die(const char *fmt, ...)
      87                 :            : {
      88                 :            :         va_list p;
      89                 :        387 :         va_start(p, fmt);
      90                 :        387 :         verror_msg(0, fmt, p);
      91                 :        387 :         die();
      92                 :            : }
      93                 :            : 
      94                 :            : void
      95                 :         30 : error_msg_and_help(const char *fmt, ...)
      96                 :            : {
      97         [ +  - ]:         30 :         if (fmt != NULL) {
      98                 :            :                 va_list p;
      99                 :         30 :                 va_start(p, fmt);
     100                 :         30 :                 verror_msg(0, fmt, p);
     101                 :            :         }
     102                 :         30 :         fprintf(stderr, "Try '%s -h' for more information.\n",
     103                 :            :                 program_invocation_name);
     104                 :         30 :         die();
     105                 :            : }
     106                 :            : 
     107                 :            : void
     108                 :      10104 : perror_msg(const char *fmt, ...)
     109                 :            : {
     110                 :            :         va_list p;
     111                 :      10104 :         va_start(p, fmt);
     112                 :      10104 :         verror_msg(errno, fmt, p);
     113                 :      10104 :         va_end(p);
     114                 :      10104 : }
     115                 :            : 
     116                 :            : void
     117                 :          2 : perror_msg_and_die(const char *fmt, ...)
     118                 :            : {
     119                 :            :         va_list p;
     120                 :          2 :         va_start(p, fmt);
     121                 :          2 :         verror_msg(errno, fmt, p);
     122                 :          2 :         die();
     123                 :            : }

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