code.delx.au - pulseaudio/blob - src/polyp/util.c

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of polypaudio.
   5
   6   polypaudio is free software; you can redistribute it and/or modify
   7   it under the terms of the GNU Lesser General Public License as
   8   published by the Free Software Foundation; either version 2.1 of the
   9   License, or (at your option) any later version.
  10
  11   polypaudio is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   Lesser General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public
  17   License along with polypaudio; if not, write to the Free Software
  18   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  19   USA.
  20 ***/
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <stdarg.h>
  27 #include <stdlib.h>
  28 #include <signal.h>
  29 #include <errno.h>
  30 #include <assert.h>
  31 #include <string.h>
  32 #include <stdio.h>
  33 #include <fcntl.h>
  34 #include <unistd.h>
  35 #include <limits.h>
  36 #include <time.h>
  37 #include <ctype.h>
  38 #include <sys/types.h>
  39 #include <sys/stat.h>
  40 #include <sys/time.h>
  41
  42 #ifdef HAVE_NETDB_H
  43 #include <netdb.h>
  44 #endif
  45
  46 #ifdef HAVE_PWD_H
  47 #include <pwd.h>
  48 #endif
  49
  50 #ifdef HAVE_GRP_H
  51 #include <grp.h>
  52 #endif
  53
  54 #ifdef HAVE_WINDOWS_H
  55 #include <windows.h>
  56 #endif
  57
  58 #include <polyp/xmalloc.h>
  59 #include <polypcore/log.h>
  60 #include <polypcore/util.h>
  61
  62 #include "util.h"
  63
  64 #ifndef OS_IS_WIN32
  65 #define PATH_SEP '/'
  66 #else
  67 #define PATH_SEP '\\'
  68 #endif
  69
  70 /* Return the current username in the specified string buffer. */
  71 char *pa_get_user_name(char *s, size_t l) {
  72     char *p;
  73     char buf[1024];
  74
  75 #ifdef HAVE_PWD_H
  76     struct passwd pw, *r;
  77 #endif
  78
  79     assert(s && l > 0);
  80
  81     if (!(p = getenv("USER")) && !(p = getenv("LOGNAME")) && !(p = getenv("USERNAME"))) {
  82 #ifdef HAVE_PWD_H
  83
  84 #ifdef HAVE_GETPWUID_R
  85         if (getpwuid_r(getuid(), &pw, buf, sizeof(buf), &r) != 0 || !r) {
  86 #else
  87         /* XXX Not thread-safe, but needed on OSes (e.g. FreeBSD 4.X)
  88             * that do not support getpwuid_r. */
  89         if ((r = getpwuid(getuid())) == NULL) {
  90 #endif
  91             snprintf(s, l, "%lu", (unsigned long) getuid());
  92             return s;
  93         }
  94
  95         p = r->pw_name;
  96
  97 #elif defined(OS_IS_WIN32) /* HAVE_PWD_H */
  98         DWORD size = sizeof(buf);
  99
 100         if (!GetUserName(buf, &size))
 101             return NULL;
 102
 103         p = buf;
 104
 105 #else /* HAVE_PWD_H */
 106         return NULL;
 107 #endif /* HAVE_PWD_H */
 108     }
 109
 110     return pa_strlcpy(s, p, l);
 111 }
 112
 113 /* Return the current hostname in the specified buffer. */
 114 char *pa_get_host_name(char *s, size_t l) {
 115     assert(s && l > 0);
 116     if (gethostname(s, l) < 0) {
 117         pa_log(__FILE__": gethostname(): %s", strerror(errno));
 118         return NULL;
 119     }
 120     s[l-1] = 0;
 121     return s;
 122 }
 123
 124 /* Return the home directory of the current user */
 125 char *pa_get_home_dir(char *s, size_t l) {
 126     char *e;
 127
 128 #ifdef HAVE_PWD_H
 129     char buf[1024];
 130     struct passwd pw, *r;
 131 #endif
 132
 133     assert(s && l);
 134
 135     if ((e = getenv("HOME")))
 136         return pa_strlcpy(s, e, l);
 137
 138     if ((e = getenv("USERPROFILE")))
 139         return pa_strlcpy(s, e, l);
 140
 141 #ifdef HAVE_PWD_H
 142 #ifdef HAVE_GETPWUID_R
 143     if (getpwuid_r(getuid(), &pw, buf, sizeof(buf), &r) != 0 || !r) {
 144         pa_log(__FILE__": getpwuid_r() failed");
 145 #else
 146     /* XXX Not thread-safe, but needed on OSes (e.g. FreeBSD 4.X)
 147         * that do not support getpwuid_r. */
 148     if ((r = getpwuid(getuid())) == NULL) {
 149         pa_log(__FILE__": getpwuid_r() failed");
 150 #endif
 151         return NULL;
 152     }
 153
 154     return pa_strlcpy(s, r->pw_dir, l);
 155 #else /* HAVE_PWD_H */
 156     return NULL;
 157 #endif
 158 }
 159
 160 struct timeval *pa_gettimeofday(struct timeval *tv) {
 161 #ifdef HAVE_GETTIMEOFDAY
 162     assert(tv);
 163
 164     return gettimeofday(tv, NULL) < 0 ? NULL : tv;
 165 #elif defined(OS_IS_WIN32)
 166     /*
 167      * Copied from implementation by Steven Edwards (LGPL).
 168      * Found on wine mailing list.
 169      */
 170
 171 #if defined(_MSC_VER) || defined(__BORLANDC__)
 172 #define EPOCHFILETIME (116444736000000000i64)
 173 #else
 174 #define EPOCHFILETIME (116444736000000000LL)
 175 #endif
 176
 177     FILETIME        ft;
 178     LARGE_INTEGER   li;
 179     __int64         t;
 180
 181     assert(tv);
 182
 183     GetSystemTimeAsFileTime(&ft);
 184     li.LowPart  = ft.dwLowDateTime;
 185     li.HighPart = ft.dwHighDateTime;
 186     t  = li.QuadPart;       /* In 100-nanosecond intervals */
 187     t -= EPOCHFILETIME;     /* Offset to the Epoch time */
 188     t /= 10;                /* In microseconds */
 189     tv->tv_sec  = (long)(t / 1000000);
 190     tv->tv_usec = (long)(t % 1000000);
 191
 192     return tv;
 193 #else
 194 #error "Platform lacks gettimeofday() or equivalent function."
 195 #endif
 196 }
 197
 198 /* Calculate the difference between the two specfified timeval
 199  * timestamsps. */
 200 pa_usec_t pa_timeval_diff(const struct timeval *a, const struct timeval *b) {
 201     pa_usec_t r;
 202     assert(a && b);
 203
 204     /* Check which whan is the earlier time and swap the two arguments if reuqired. */
 205     if (pa_timeval_cmp(a, b) < 0) {
 206         const struct timeval *c;
 207         c = a;
 208         a = b;
 209         b = c;
 210     }
 211
 212     /* Calculate the second difference*/
 213     r = ((pa_usec_t) a->tv_sec - b->tv_sec)* 1000000;
 214
 215     /* Calculate the microsecond difference */
 216     if (a->tv_usec > b->tv_usec)
 217         r += ((pa_usec_t) a->tv_usec - b->tv_usec);
 218     else if (a->tv_usec < b->tv_usec)
 219         r -= ((pa_usec_t) b->tv_usec - a->tv_usec);
 220
 221     return r;
 222 }
 223
 224 /* Compare the two timeval structs and return 0 when equal, negative when a < b, positive otherwse */
 225 int pa_timeval_cmp(const struct timeval *a, const struct timeval *b) {
 226     assert(a && b);
 227
 228     if (a->tv_sec < b->tv_sec)
 229         return -1;
 230
 231     if (a->tv_sec > b->tv_sec)
 232         return 1;
 233
 234     if (a->tv_usec < b->tv_usec)
 235         return -1;
 236
 237     if (a->tv_usec > b->tv_usec)
 238         return 1;
 239
 240     return 0;
 241 }
 242
 243 /* Return the time difference between now and the specified timestamp */
 244 pa_usec_t pa_timeval_age(const struct timeval *tv) {
 245     struct timeval now;
 246     assert(tv);
 247
 248     return pa_timeval_diff(pa_gettimeofday(&now), tv);
 249 }
 250
 251 /* Add the specified time inmicroseconds to the specified timeval structure */
 252 void pa_timeval_add(struct timeval *tv, pa_usec_t v) {
 253     unsigned long secs;
 254     assert(tv);
 255
 256     secs = (v/1000000);
 257     tv->tv_sec += (unsigned long) secs;
 258     v -= secs*1000000;
 259
 260     tv->tv_usec += v;
 261
 262     /* Normalize */
 263     while (tv->tv_usec >= 1000000) {
 264         tv->tv_sec++;
 265         tv->tv_usec -= 1000000;
 266     }
 267 }
 268
 269 /* Return the binary file name of the current process. Works on Linux
 270  * only. This shoul be used for eyecandy only, don't rely on return
 271  * non-NULL! */
 272 char *pa_get_binary_name(char *s, size_t l) {
 273
 274 #ifdef HAVE_READLINK
 275     char path[PATH_MAX];
 276     int i;
 277     assert(s && l);
 278
 279     /* This works on Linux only */
 280
 281     snprintf(path, sizeof(path), "/proc/%u/exe", (unsigned) getpid());
 282     if ((i = readlink(path, s, l-1)) < 0)
 283         return NULL;
 284
 285     s[i] = 0;
 286     return s;
 287 #elif defined(OS_IS_WIN32)
 288     char path[PATH_MAX];
 289     if (!GetModuleFileName(NULL, path, PATH_MAX))
 290         return NULL;
 291     pa_strlcpy(s, pa_path_get_filename(path), l);
 292     return s;
 293 #else
 294     return NULL;
 295 #endif
 296 }
 297
 298 /* Return a pointer to the filename inside a path (which is the last
 299  * component). */
 300 const char *pa_path_get_filename(const char *p) {
 301     char *fn;
 302
 303     if ((fn = strrchr(p, PATH_SEP)))
 304         return fn+1;
 305
 306     return (const char*) p;
 307 }
 308
 309 /* Return the fully qualified domain name in *s */
 310 char *pa_get_fqdn(char *s, size_t l) {
 311     char hn[256];
 312 #ifdef HAVE_GETADDRINFO
 313     struct addrinfo *a, hints;
 314 #endif
 315
 316     if (!pa_get_host_name(hn, sizeof(hn)))
 317         return NULL;
 318
 319 #ifdef HAVE_GETADDRINFO
 320     memset(&hints, 0, sizeof(hints));
 321     hints.ai_family = AF_UNSPEC;
 322     hints.ai_flags = AI_CANONNAME;
 323
 324     if (getaddrinfo(hn, NULL, &hints, &a) < 0 || !a || !a->ai_canonname || !*a->ai_canonname)
 325         return pa_strlcpy(s, hn, l);
 326
 327     pa_strlcpy(s, a->ai_canonname, l);
 328     freeaddrinfo(a);
 329     return s;
 330 #else
 331     return pa_strlcpy(s, hn, l);
 332 #endif
 333 }
 334
 335 /* Wait t milliseconds */
 336 int pa_msleep(unsigned long t) {
 337 #ifdef OS_IS_WIN32
 338     Sleep(t);
 339     return 0;
 340 #elif defined(HAVE_NANOSLEEP)
 341     struct timespec ts;
 342
 343     ts.tv_sec = t/1000;
 344     ts.tv_nsec = (t % 1000) * 1000000;
 345
 346     return nanosleep(&ts, NULL);
 347 #else
 348 #error "Platform lacks a sleep function."
 349 #endif
 350 }