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1 /* print.c -- Print the current backtrace.
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145
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2 Copyright (C) 2012-2020 Free Software Foundation, Inc.
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3 Written by Ian Lance Taylor, Google.
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4
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5 Redistribution and use in source and binary forms, with or without
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6 modification, are permitted provided that the following conditions are
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7 met:
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8
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9 (1) Redistributions of source code must retain the above copyright
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10 notice, this list of conditions and the following disclaimer.
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11
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12 (2) Redistributions in binary form must reproduce the above copyright
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13 notice, this list of conditions and the following disclaimer in
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14 the documentation and/or other materials provided with the
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15 distribution.
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16
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17 (3) The name of the author may not be used to
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18 endorse or promote products derived from this software without
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19 specific prior written permission.
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20
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21 THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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22 IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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23 WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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24 DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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25 INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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26 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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27 SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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28 HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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29 STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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30 IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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31 POSSIBILITY OF SUCH DAMAGE. */
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32
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33 #include "config.h"
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34
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35 #include <stdio.h>
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36 #include <string.h>
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37 #include <sys/types.h>
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38
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39 #include "backtrace.h"
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40 #include "internal.h"
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41
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42 /* Passed to callbacks. */
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43
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44 struct print_data
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45 {
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46 struct backtrace_state *state;
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47 FILE *f;
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48 };
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49
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50 /* Print one level of a backtrace. */
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51
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52 static int
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53 print_callback (void *data, uintptr_t pc, const char *filename, int lineno,
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54 const char *function)
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55 {
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56 struct print_data *pdata = (struct print_data *) data;
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57
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58 fprintf (pdata->f, "0x%lx %s\n\t%s:%d\n",
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59 (unsigned long) pc,
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60 function == NULL ? "???" : function,
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61 filename == NULL ? "???" : filename,
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62 lineno);
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63 return 0;
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64 }
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65
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66 /* Print errors to stderr. */
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67
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68 static void
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69 error_callback (void *data, const char *msg, int errnum)
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70 {
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71 struct print_data *pdata = (struct print_data *) data;
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72
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73 if (pdata->state->filename != NULL)
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74 fprintf (stderr, "%s: ", pdata->state->filename);
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75 fprintf (stderr, "libbacktrace: %s", msg);
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76 if (errnum > 0)
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77 fprintf (stderr, ": %s", strerror (errnum));
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78 fputc ('\n', stderr);
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79 }
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80
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81 /* Print a backtrace. */
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82
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83 void __attribute__((noinline))
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84 backtrace_print (struct backtrace_state *state, int skip, FILE *f)
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85 {
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86 struct print_data data;
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87
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88 data.state = state;
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89 data.f = f;
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90 backtrace_full (state, skip + 1, print_callback, error_callback,
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91 (void *) &data);
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92 }
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