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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
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13#include <stdio.h>
14#include "monitor.h"
b4a51f7f 15
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16/*
17 * Print to current monitor if we have one, else to stderr.
18 * TODO should return int, so callers can calculate width, but that
19 * requires surgery to monitor_vprintf(). Left for another day.
20 */
21void error_vprintf(const char *fmt, va_list ap)
b4a51f7f 22{
6e4f984c 23 if (cur_mon) {
ba0fe87a 24 monitor_vprintf(cur_mon, fmt, ap);
6e4f984c 25 } else {
ba0fe87a 26 vfprintf(stderr, fmt, ap);
b4a51f7f 27 }
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28}
29
30/*
31 * Print to current monitor if we have one, else to stderr.
32 * TODO just like error_vprintf()
33 */
34void error_printf(const char *fmt, ...)
35{
36 va_list ap;
37
38 va_start(ap, fmt);
39 error_vprintf(fmt, ap);
40 va_end(ap);
41}
42
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43void error_printf_unless_qmp(const char *fmt, ...)
44{
45 va_list ap;
46
47 if (!monitor_cur_is_qmp()) {
48 va_start(ap, fmt);
49 error_vprintf(fmt, ap);
50 va_end(ap);
51 }
52}
53
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54static Location std_loc = {
55 .kind = LOC_NONE
56};
57static Location *cur_loc = &std_loc;
58
59/*
60 * Push location saved in LOC onto the location stack, return it.
61 * The top of that stack is the current location.
62 * Needs a matching loc_pop().
63 */
64Location *loc_push_restore(Location *loc)
65{
66 assert(!loc->prev);
67 loc->prev = cur_loc;
68 cur_loc = loc;
69 return loc;
70}
71
72/*
73 * Initialize *LOC to "nowhere", push it onto the location stack.
74 * The top of that stack is the current location.
75 * Needs a matching loc_pop().
76 * Return LOC.
77 */
78Location *loc_push_none(Location *loc)
79{
80 loc->kind = LOC_NONE;
81 loc->prev = NULL;
82 return loc_push_restore(loc);
83}
84
85/*
86 * Pop the location stack.
87 * LOC must be the current location, i.e. the top of the stack.
88 */
89Location *loc_pop(Location *loc)
90{
91 assert(cur_loc == loc && loc->prev);
92 cur_loc = loc->prev;
93 loc->prev = NULL;
94 return loc;
95}
96
97/*
98 * Save the current location in LOC, return LOC.
99 */
100Location *loc_save(Location *loc)
101{
102 *loc = *cur_loc;
103 loc->prev = NULL;
104 return loc;
105}
106
107/*
108 * Change the current location to the one saved in LOC.
109 */
110void loc_restore(Location *loc)
111{
112 Location *prev = cur_loc->prev;
113 assert(!loc->prev);
114 *cur_loc = *loc;
115 cur_loc->prev = prev;
116}
117
118/*
119 * Change the current location to "nowhere in particular".
120 */
121void loc_set_none(void)
122{
123 cur_loc->kind = LOC_NONE;
124}
125
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126/*
127 * Change the current location to argument ARGV[IDX..IDX+CNT-1].
128 */
129void loc_set_cmdline(char **argv, int idx, int cnt)
130{
131 cur_loc->kind = LOC_CMDLINE;
132 cur_loc->num = cnt;
133 cur_loc->ptr = argv + idx;
134}
135
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136/*
137 * Change the current location to file FNAME, line LNO.
138 */
139void loc_set_file(const char *fname, int lno)
140{
141 assert (fname || cur_loc->kind == LOC_FILE);
142 cur_loc->kind = LOC_FILE;
143 cur_loc->num = lno;
144 if (fname) {
145 cur_loc->ptr = fname;
146 }
147}
148
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149static const char *progname;
150
151/*
152 * Set the program name for error_print_loc().
153 */
154void error_set_progname(const char *argv0)
155{
156 const char *p = strrchr(argv0, '/');
157 progname = p ? p + 1 : argv0;
158}
159
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160const char *error_get_progname(void)
161{
162 return progname;
163}
164
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165/*
166 * Print current location to current monitor if we have one, else to stderr.
167 */
168void error_print_loc(void)
169{
65abca0a 170 const char *sep = "";
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171 int i;
172 const char *const *argp;
65abca0a 173
6627f645 174 if (!cur_mon && progname) {
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175 fprintf(stderr, "%s:", progname);
176 sep = " ";
177 }
827b0813 178 switch (cur_loc->kind) {
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179 case LOC_CMDLINE:
180 argp = cur_loc->ptr;
181 for (i = 0; i < cur_loc->num; i++) {
182 error_printf("%s%s", sep, argp[i]);
183 sep = " ";
184 }
185 error_printf(": ");
186 break;
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187 case LOC_FILE:
188 error_printf("%s:", (const char *)cur_loc->ptr);
189 if (cur_loc->num) {
190 error_printf("%d:", cur_loc->num);
191 }
192 error_printf(" ");
193 break;
65abca0a 194 default:
bb334b12 195 error_printf("%s", sep);
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196 }
197}
198
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199/*
200 * Print an error message to current monitor if we have one, else to stderr.
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201 * Format arguments like sprintf(). The result should not contain
202 * newlines.
827b0813 203 * Prepend the current location and append a newline.
ab5b027e 204 * It's wrong to call this in a QMP monitor. Use qerror_report() there.
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205 */
206void error_report(const char *fmt, ...)
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207{
208 va_list ap;
209
827b0813 210 error_print_loc();
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211 va_start(ap, fmt);
212 error_vprintf(fmt, ap);
213 va_end(ap);
1ecda02b 214 error_printf("\n");
b4a51f7f 215}