obsolete/ltt-usertrace/ltt/ltt-facility-custom-user_generic.h

   1 #ifndef _LTT_FACILITY_CUSTOM_USER_GENERIC_H_
   2 #define _LTT_FACILITY_CUSTOM_USER_GENERIC_H_
   3
   4 #include <sys/types.h>
   5 #include <ltt/ltt-facility-id-user_generic.h>
   6 #include <ltt/ltt-usertrace.h>
   7 #include <stdio.h>
   8 #include <stdlib.h>
   9 #include <stdarg.h>
  10
  11 #ifdef __cplusplus
  12 extern "C" {
  13 #endif
  14
  15 static int trace_user_generic_slow_printf(
  16                 const char *fmt, ...)
  17 #ifndef LTT_TRACE
  18 {
  19 }
  20 #else
  21 {
  22         /* Guess we need no more than 100 bytes. */
  23         int n, size = 104;
  24         char *p, *np;
  25         va_list ap;
  26         int ret;
  27
  28         size += ltt_align(size, sizeof(void*));
  29         if ((p = malloc (size)) == NULL)
  30                 return -1;
  31
  32         while (1) {
  33                 /* Try to print in the allocated space. */
  34                 va_start(ap, fmt);
  35                 n = vsnprintf (p, size, fmt, ap);
  36                 va_end(ap);
  37                 /* If that worked, trace the string. */
  38                 if (n > -1 && n < size) {
  39                         ret = trace_user_generic_slow_printf_param_buffer(p, n+1+ltt_align(n+1, sizeof(void*)));
  40                         free(p);
  41                         return ret;
  42                 }
  43                 /* Else try again with more space. */
  44                 if (n > -1)    /* glibc 2.1 */
  45                          size = n+1; /* precisely what is needed */
  46                 else           /* glibc 2.0 */
  47                          size *= 2;  /* twice the old size */
  48                 size += ltt_align(size, sizeof(void*));
  49                 if ((np = realloc (p, size)) == NULL) {
  50                          free(p);
  51                          return -1;
  52                 } else {
  53                          p = np;
  54                 }
  55         }
  56 }
  57 #endif //LTT_TRACE
  58
  59 #ifdef __cplusplus
  60 } /* end of extern "C" */
  61 #endif
  62
  63 #endif //_LTT_FACILITY_CUSTOM_USER_GENERIC_H_