tidying
[exim.git] / src / src / debug.c
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1/*************************************************
2* Exim - an Internet mail transport agent *
3*************************************************/
4
3386088d 5/* Copyright (c) University of Cambridge 1995 - 2015 */
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6/* See the file NOTICE for conditions of use and distribution. */
7
8
9#include "exim.h"
10
c2bcbe20 11static uschar debug_buffer[2048];
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12static uschar *debug_ptr = debug_buffer;
13static int debug_prefix_length = 0;
14
15
16
17/*************************************************
18* Print tree *
19*************************************************/
20
21/* Recursive tree-printing subroutine. It uses a static vector of uschar to
22hold the line-drawing characters that need to be printed on every line as it
23moves down the page. This function is used only in debugging circumstances. The
24output is done via debug_printf(). */
25
26#define tree_printlinesize 132 /* line size for printing */
27static uschar tree_printline[tree_printlinesize];
28
29/* Internal recursive subroutine.
30
31Arguments:
32 p tree node
4c04137d 33 pos amount of indenting & vertical bars to print
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34 barswitch if TRUE print | at the pos value
35
36Returns: nothing
37*/
38
39static void
40tree_printsub(tree_node *p, int pos, int barswitch)
41{
42int i;
43if (p->right != NULL) tree_printsub(p->right, pos+2, 1);
44for (i = 0; i <= pos-1; i++) debug_printf("%c", tree_printline[i]);
45debug_printf("-->%s [%d]\n", p->name, p->balance);
46tree_printline[pos] = barswitch? '|' : ' ';
47if (p->left != NULL)
48 {
49 tree_printline[pos+2] = '|';
50 tree_printsub(p->left, pos+2, 0);
51 }
52}
53
54/* The external function, with just a tree node argument. */
55
56void
57debug_print_tree(tree_node *p)
58{
59int i;
60for (i = 0; i < tree_printlinesize; i++) tree_printline[i] = ' ';
61if (p == NULL) debug_printf("Empty Tree\n"); else tree_printsub(p, 0, 0);
62debug_printf("---- End of tree ----\n");
63}
64
65
66
67/*************************************************
68* Print an argv vector *
69*************************************************/
70
71/* Called when about to obey execv().
72
73Argument: the argv vector
74Returns: nothing
75*/
76
77void
55414b25 78debug_print_argv(const uschar ** argv)
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79{
80debug_printf("exec");
81while (*argv != NULL) debug_printf(" %.256s", *argv++);
82debug_printf("\n");
83}
84
85
86
87/*************************************************
88* Expand and print debugging string *
89*************************************************/
90
91/* The string is expanded and written as debugging output. If
92expansion fails, a message is written instead.
93
94Argument: the string
95Returns: nothing
96*/
97
98void
99debug_print_string(uschar *debug_string)
100{
101if (debug_string == NULL) return;
102HDEBUG(D_any|D_v)
103 {
104 uschar *s = expand_string(debug_string);
105 if (s == NULL)
106 debug_printf("failed to expand debug_output \"%s\": %s\n", debug_string,
107 expand_string_message);
108 else if (s[0] != 0)
109 debug_printf("%s%s", s, (s[Ustrlen(s)-1] == '\n')? "" : "\n");
110 }
111}
112
113
114
115/*************************************************
116* Print current uids and gids *
117*************************************************/
118
119/*
120Argument: an introductory string
121Returns: nothing
122*/
123
124void
125debug_print_ids(uschar *s)
126{
127debug_printf("%s uid=%ld gid=%ld euid=%ld egid=%ld\n", s,
128 (long int)getuid(), (long int)getgid(), (long int)geteuid(),
129 (long int)getegid());
130}
131
132
133
134
135/*************************************************
136* Print debugging message *
137*************************************************/
138
139/* There are two entries, one for use when being called directly from a
e1d04f48 140function with a variable argument list, one for prepending an indent.
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141
142If debug_pid is nonzero, print the pid at the start of each line. This is for
143tidier output when running parallel remote deliveries with debugging turned on.
144Must do the whole thing with a single printf and flush, as otherwise output may
145get interleaved. Since some calls to debug_printf() don't end with newline,
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146we save up the text until we do get the newline.
147Take care to not disturb errno. */
059ec3d9 148
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149
150/* Debug printf indented by ACL nest depth */
151void
152debug_printf_indent(const char * format, ...)
153{
154va_list ap;
e1d04f48 155va_start(ap, format);
398f9af3 156debug_vprintf(acl_level + expand_level, format, ap);
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157va_end(ap);
158}
159
059ec3d9 160void
1ba28e2b 161debug_printf(const char *format, ...)
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162{
163va_list ap;
164va_start(ap, format);
398f9af3 165debug_vprintf(0, format, ap);
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166va_end(ap);
167}
168
169void
398f9af3 170debug_vprintf(int indent, const char *format, va_list ap)
059ec3d9 171{
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172int save_errno = errno;
173
174if (!debug_file) return;
059ec3d9 175
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176/* Various things can be inserted at the start of a line. Don't use the
177tod_stamp() function for the timestamp, because that will overwrite the
178timestamp buffer, which may contain something useful. (This was a bug fix: the
179+memory debugging with +timestamp did cause a problem.) */
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180
181if (debug_ptr == debug_buffer)
182 {
183 DEBUG(D_timestamp)
184 {
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185 struct timeval now;
186 time_t tmp;
187 struct tm * t;
188
189 gettimeofday(&now, NULL);
190 tmp = now.tv_sec;
55b583f6 191 t = timestamps_utc ? gmtime(&tmp) : localtime(&tmp);
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192 debug_ptr += sprintf(CS debug_ptr,
193 LOGGING(millisec) ? "%02d:%02d:%02d.%03d " : "%02d:%02d:%02d ",
cab0c277 194 t->tm_hour, t->tm_min, t->tm_sec, (int)(now.tv_usec/1000));
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195 }
196
197 DEBUG(D_pid)
198 {
5976eb99 199 debug_ptr += sprintf(CS debug_ptr, "%5d ", (int)getpid());
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200 }
201
202 /* Set up prefix if outputting for host checking and not debugging */
203
204 if (host_checking && debug_selector == 0)
205 {
206 Ustrcpy(debug_ptr, ">>> ");
207 debug_ptr += 4;
208 }
209
210 debug_prefix_length = debug_ptr - debug_buffer;
211 }
212
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213if (indent > 0)
214 {
215 int i;
216 for (i = indent >> 2; i > 0; i--)
217 {
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218 Ustrcpy(debug_ptr, " " UTF8_VERT_2DASH);
219 debug_ptr += 6; /* 3 spaces + 3 UTF-8 octets */
220 debug_prefix_length += 6;
398f9af3 221 }
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222 Ustrncpy(debug_ptr, " ", indent &= 3);
223 debug_ptr += indent;
224 debug_prefix_length += indent;
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225 }
226
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227/* Use the checked formatting routine to ensure that the buffer
228does not overflow. Ensure there's space for a newline at the end. */
229
230if (!string_vformat(debug_ptr,
231 sizeof(debug_buffer) - (debug_ptr - debug_buffer) - 1, format, ap))
232 {
233 uschar *s = US"**** debug string too long - truncated ****\n";
234 uschar *p = debug_buffer + Ustrlen(debug_buffer);
235 int maxlen = sizeof(debug_buffer) - Ustrlen(s) - 3;
236 if (p > debug_buffer + maxlen) p = debug_buffer + maxlen;
237 if (p > debug_buffer && p[-1] != '\n') *p++ = '\n';
238 Ustrcpy(p, s);
239 }
240
241while(*debug_ptr != 0) debug_ptr++;
242
243/* Output the line if it is complete. If we added any prefix data and there
244are internal newlines, make sure the prefix is on the continuation lines,
245as long as there is room in the buffer. We want to do just a single fprintf()
246so as to avoid interleaving. */
247
248if (debug_ptr[-1] == '\n')
249 {
250 if (debug_prefix_length > 0)
251 {
252 uschar *p = debug_buffer;
253 int left = sizeof(debug_buffer) - (debug_ptr - debug_buffer) - 1;
254 while ((p = Ustrchr(p, '\n') + 1) != debug_ptr &&
255 left >= debug_prefix_length)
256 {
257 int len = debug_ptr - p;
258 memmove(p + debug_prefix_length, p, len + 1);
259 memmove(p, debug_buffer, debug_prefix_length);
260 debug_ptr += debug_prefix_length;
261 left -= debug_prefix_length;
262 }
263 }
264
265 fprintf(debug_file, "%s", CS debug_buffer);
266 fflush(debug_file);
267 debug_ptr = debug_buffer;
268 debug_prefix_length = 0;
269 }
829dd842 270errno = save_errno;
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271}
272
273/* End of debug.c */