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1 #include <errno.h>
2 #include <stdarg.h>
3 #include <stdio.h>
4 #include <stdlib.h>
5 #include <string.h>
6
7 #include "warnp.h"
8
9 static int initialized = 0;
10 static char * name = NULL;
11
12 /* Free the name string. */
13 static void
14 done(void)
15 {
16
17 free(name);
18 name = NULL;
19 }
20
21 /**
22 * warnp_setprogname(progname):
23 * Set the program name to be used by warn() and warnx() to ${progname}.
24 */
25 void
26 warnp_setprogname(const char * progname)
27 {
28 const char * p;
29
30 /* Free the name if we already have one. */
31 free(name);
32
33 /* Find the last segment of the program name. */
34 for (p = progname; progname[0] != '\0'; progname++)
35 if (progname[0] == '/')
36 p = progname + 1;
37
38 /* Copy the name string. */
39 name = strdup(p);
40
41 /* If we haven't already done so, register our exit handler. */
42 if (initialized == 0) {
43 atexit(done);
44 initialized = 1;
45 }
46 }
47
48 void
49 warn(const char * fmt, ...)
50 {
51 va_list ap;
52
53 va_start(ap, fmt);
54 fprintf(stderr, "%s", (name != NULL) ? name : "(unknown)");
55 if (fmt != NULL) {
56 fprintf(stderr, ": ");
57 vfprintf(stderr, fmt, ap);
58 }
59 fprintf(stderr, ": %s\n", strerror(errno));
60 va_end(ap);
61 }
62
63 void
64 warnx(const char * fmt, ...)
65 {
66 va_list ap;
67
68 va_start(ap, fmt);
69 fprintf(stderr, "%s", (name != NULL) ? name : "(unknown)");
70 if (fmt != NULL) {
71 fprintf(stderr, ": ");
72 vfprintf(stderr, fmt, ap);
73 }
74 fprintf(stderr, "\n");
75 va_end(ap);
76 }
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