git.distorted.org.uk Git - u/mdw/putty/blob - unix/uxmisc.c

   1 /*
   2  * PuTTY miscellaneous Unix stuff
   3  */
   4
   5 #include <stdio.h>
   6 #include <unistd.h>
   7 #include <sys/time.h>
   8 #include <sys/types.h>
   9 #include <pwd.h>
  10
  11 #include "putty.h"
  12
  13 unsigned long getticks(void)
  14 {
  15     struct timeval tv;
  16     gettimeofday(&tv, NULL);
  17     /*
  18      * This will wrap around approximately every 4000 seconds, i.e.
  19      * just over an hour, which is more than enough.
  20      */
  21     return tv.tv_sec * 1000000 + tv.tv_usec;
  22 }
  23
  24
  25
  26 Filename filename_from_str(const char *str)
  27 {
  28     Filename ret;
  29     strncpy(ret.path, str, sizeof(ret.path));
  30     ret.path[sizeof(ret.path)-1] = '\0';
  31     return ret;
  32 }
  33
  34 const char *filename_to_str(const Filename *fn)
  35 {
  36     return fn->path;
  37 }
  38
  39 int filename_equal(Filename f1, Filename f2)
  40 {
  41     return !strcmp(f1.path, f2.path);
  42 }
  43
  44 int filename_is_null(Filename fn)
  45 {
  46     return !*fn.path;
  47 }
  48
  49 #ifdef DEBUG
  50 static FILE *debug_fp = NULL;
  51
  52 void dputs(char *buf)
  53 {
  54     if (!debug_fp) {
  55         debug_fp = fopen("debug.log", "w");
  56     }
  57
  58     write(1, buf, strlen(buf));
  59
  60     fputs(buf, debug_fp);
  61     fflush(debug_fp);
  62 }
  63 #endif
  64
  65 char *get_username(void)
  66 {
  67     struct passwd *p;
  68     uid_t uid = getuid();
  69     char *user, *ret = NULL;
  70
  71     /*
  72      * First, find who we think we are using getlogin. If this
  73      * agrees with our uid, we'll go along with it. This should
  74      * allow sharing of uids between several login names whilst
  75      * coping correctly with people who have su'ed.
  76      */
  77     user = getlogin();
  78     setpwent();
  79     if (user)
  80         p = getpwnam(user);
  81     else
  82         p = NULL;
  83     if (p && p->pw_uid == uid) {
  84         /*
  85          * The result of getlogin() really does correspond to
  86          * our uid. Fine.
  87          */
  88         ret = user;
  89     } else {
  90         /*
  91          * If that didn't work, for whatever reason, we'll do
  92          * the simpler version: look up our uid in the password
  93          * file and map it straight to a name.
  94          */
  95         p = getpwuid(uid);
  96         if (!p)
  97             return NULL;
  98         ret = p->pw_name;
  99     }
 100     endpwent();
 101
 102     return dupstr(ret);
 103 }