qemu-error.c

   1 /*
   2  * Error reporting
   3  *
   4  * Copyright (C) 2010 Red Hat Inc.
   5  *
   6  * Authors:
   7  *  Markus Armbruster <armbru@redhat.com>,
   8  *
   9  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  10  * See the COPYING file in the top-level directory.
  11  */
  12
  13 #include <stdio.h>
  14 #include "monitor.h"
  15 #include "sysemu.h"
  16
  17 /*
  18  * Print to current monitor if we have one, else to stderr.
  19  * TODO should return int, so callers can calculate width, but that
  20  * requires surgery to monitor_vprintf().  Left for another day.
  21  */
  22 void error_vprintf(const char *fmt, va_list ap)
  23 {
  24     if (cur_mon) {
  25         monitor_vprintf(cur_mon, fmt, ap);
  26     } else {
  27         vfprintf(stderr, fmt, ap);
  28     }
  29 }
  30
  31 /*
  32  * Print to current monitor if we have one, else to stderr.
  33  * TODO just like error_vprintf()
  34  */
  35 void error_printf(const char *fmt, ...)
  36 {
  37     va_list ap;
  38
  39     va_start(ap, fmt);
  40     error_vprintf(fmt, ap);
  41     va_end(ap);
  42 }
  43
  44 void error_printf_unless_qmp(const char *fmt, ...)
  45 {
  46     va_list ap;
  47
  48     if (!monitor_cur_is_qmp()) {
  49         va_start(ap, fmt);
  50         error_vprintf(fmt, ap);
  51         va_end(ap);
  52     }
  53 }
  54
  55 static Location std_loc = {
  56     .kind = LOC_NONE
  57 };
  58 static Location *cur_loc = &std_loc;
  59
  60 /*
  61  * Push location saved in LOC onto the location stack, return it.
  62  * The top of that stack is the current location.
  63  * Needs a matching loc_pop().
  64  */
  65 Location *loc_push_restore(Location *loc)
  66 {
  67     assert(!loc->prev);
  68     loc->prev = cur_loc;
  69     cur_loc = loc;
  70     return loc;
  71 }
  72
  73 /*
  74  * Initialize *LOC to "nowhere", push it onto the location stack.
  75  * The top of that stack is the current location.
  76  * Needs a matching loc_pop().
  77  * Return LOC.
  78  */
  79 Location *loc_push_none(Location *loc)
  80 {
  81     loc->kind = LOC_NONE;
  82     loc->prev = NULL;
  83     return loc_push_restore(loc);
  84 }
  85
  86 /*
  87  * Pop the location stack.
  88  * LOC must be the current location, i.e. the top of the stack.
  89  */
  90 Location *loc_pop(Location *loc)
  91 {
  92     assert(cur_loc == loc && loc->prev);
  93     cur_loc = loc->prev;
  94     loc->prev = NULL;
  95     return loc;
  96 }
  97
  98 /*
  99  * Save the current location in LOC, return LOC.
 100  */
 101 Location *loc_save(Location *loc)
 102 {
 103     *loc = *cur_loc;
 104     loc->prev = NULL;
 105     return loc;
 106 }
 107
 108 /*
 109  * Change the current location to the one saved in LOC.
 110  */
 111 void loc_restore(Location *loc)
 112 {
 113     Location *prev = cur_loc->prev;
 114     assert(!loc->prev);
 115     *cur_loc = *loc;
 116     cur_loc->prev = prev;
 117 }
 118
 119 /*
 120  * Change the current location to "nowhere in particular".
 121  */
 122 void loc_set_none(void)
 123 {
 124     cur_loc->kind = LOC_NONE;
 125 }
 126
 127 /*
 128  * Change the current location to argument ARGV[IDX..IDX+CNT-1].
 129  */
 130 void loc_set_cmdline(char **argv, int idx, int cnt)
 131 {
 132     cur_loc->kind = LOC_CMDLINE;
 133     cur_loc->num = cnt;
 134     cur_loc->ptr = argv + idx;
 135 }
 136
 137 /*
 138  * Change the current location to file FNAME, line LNO.
 139  */
 140 void loc_set_file(const char *fname, int lno)
 141 {
 142     assert (fname || cur_loc->kind == LOC_FILE);
 143     cur_loc->kind = LOC_FILE;
 144     cur_loc->num = lno;
 145     if (fname) {
 146         cur_loc->ptr = fname;
 147     }
 148 }
 149
 150 static const char *progname;
 151
 152 /*
 153  * Set the program name for error_print_loc().
 154  */
 155 void error_set_progname(const char *argv0)
 156 {
 157     const char *p = strrchr(argv0, '/');
 158     progname = p ? p + 1 : argv0;
 159 }
 160
 161 /*
 162  * Print current location to current monitor if we have one, else to stderr.
 163  */
 164 void error_print_loc(void)
 165 {
 166     const char *sep = "";
 167     int i;
 168     const char *const *argp;
 169
 170     if (!cur_mon && progname) {
 171         fprintf(stderr, "%s:", progname);
 172         sep = " ";
 173     }
 174     switch (cur_loc->kind) {
 175     case LOC_CMDLINE:
 176         argp = cur_loc->ptr;
 177         for (i = 0; i < cur_loc->num; i++) {
 178             error_printf("%s%s", sep, argp[i]);
 179             sep = " ";
 180         }
 181         error_printf(": ");
 182         break;
 183     case LOC_FILE:
 184         error_printf("%s:", (const char *)cur_loc->ptr);
 185         if (cur_loc->num) {
 186             error_printf("%d:", cur_loc->num);
 187         }
 188         error_printf(" ");
 189         break;
 190     default:
 191         error_printf("%s", sep);
 192     }
 193 }
 194
 195 /*
 196  * Print an error message to current monitor if we have one, else to stderr.
 197  * Prepend the current location and append a newline.
 198  * It's wrong to call this in a QMP monitor.  Use qerror_report() there.
 199  */
 200 void error_report(const char *fmt, ...)
 201 {
 202     va_list ap;
 203
 204     error_print_loc();
 205     va_start(ap, fmt);
 206     error_vprintf(fmt, ap);
 207     va_end(ap);
 208     error_printf("\n");
 209 }