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authorDaniel Friesel <derf@finalrewind.org>2018-10-17 20:40:17 +0200
committerDaniel Friesel <derf@finalrewind.org>2018-10-17 20:40:17 +0200
commit9803fc41e8e6a820634f41d2196bdced7cbbc99f (patch)
tree593f59640ebe9d8eef90e3ddf8988dc7d714690c /src
parenta9d46da64d02561bf2f545b3271575b304eda913 (diff)
Use random() instead of rand() to increase portability
Quoting glibc rand(3): The versions of rand() and srand() in the Linux C Library use the same random number generator as random(3) and srandom(3), so the lower-order bits should be as random as the higher-order bits. However, on older rand() implementations, and on current implementations on different systems, the lower-order bits are much less random than the higher-order bits. Do not use this function in applications intended to be portable when good randomness is needed. (Use random(3) instead.)
Diffstat (limited to 'src')
-rw-r--r--src/collage.c4
-rw-r--r--src/gib_list.c2
-rw-r--r--src/keyevents.c2
-rw-r--r--src/main.c2
-rw-r--r--src/slideshow.c2
-rw-r--r--src/wallpaper.c2
6 files changed, 7 insertions, 7 deletions
diff --git a/src/collage.c b/src/collage.c
index 2a4d9f9..b616bef 100644
--- a/src/collage.c
+++ b/src/collage.c
@@ -145,8 +145,8 @@ void init_collage_mode(void)
}
/* pick random coords for thumbnail */
- xxx = ((w - www) * ((double) rand() / RAND_MAX));
- yyy = ((h - hhh) * ((double) rand() / RAND_MAX));
+ xxx = ((w - www) * ((double) random() / RAND_MAX));
+ yyy = ((h - hhh) * ((double) random() / RAND_MAX));
D(("image going on at x=%d, y=%d\n", xxx, yyy));
im_thumb = gib_imlib_create_cropped_scaled_image(im_temp,
diff --git a/src/gib_list.c b/src/gib_list.c
index 5384d98..a8ba1dd 100644
--- a/src/gib_list.c
+++ b/src/gib_list.c
@@ -362,7 +362,7 @@ gib_list_randomize(gib_list * list)
}
for (i = 0; i < len - 1; i++)
{
- r = i + rand() / (RAND_MAX / (len - i) + 1 );
+ r = i + random() / (RAND_MAX / (len - i) + 1 );
t = farray[r];
farray[r] = farray[i];
farray[i] = t;
diff --git a/src/keyevents.c b/src/keyevents.c
index 689aebd..43bc82a 100644
--- a/src/keyevents.c
+++ b/src/keyevents.c
@@ -686,7 +686,7 @@ void feh_event_handle_generic(winwidget winwid, unsigned int state, KeySym keysy
}
else if (feh_is_kp(EVENT_jump_random, state, keysym, button)) {
if (winwid->type == WIN_TYPE_THUMBNAIL)
- feh_thumbnail_select_next(winwid, rand() % (filelist_len - 1));
+ feh_thumbnail_select_next(winwid, random() % (filelist_len - 1));
else
slideshow_change_image(winwid, SLIDE_RAND, 1);
}
diff --git a/src/main.c b/src/main.c
index 1a76e2d..779e0bd 100644
--- a/src/main.c
+++ b/src/main.c
@@ -42,7 +42,7 @@ int main(int argc, char **argv)
{
atexit(feh_clean_exit);
- srand(getpid() * time(NULL) % ((unsigned int) -1));
+ srandom(getpid() * time(NULL) % ((unsigned int) -1));
setup_signal_handlers();
init_parse_options(argc, argv);
diff --git a/src/slideshow.c b/src/slideshow.c
index 3770677..b404318 100644
--- a/src/slideshow.c
+++ b/src/slideshow.c
@@ -258,7 +258,7 @@ void slideshow_change_image(winwidget winwid, int change, int render)
case SLIDE_RAND:
if (filelist_len > 1) {
current_file = feh_list_jump(filelist, current_file, FORWARD,
- (rand() % (filelist_len - 1)) + 1);
+ (random() % (filelist_len - 1)) + 1);
change = SLIDE_NEXT;
}
break;
diff --git a/src/wallpaper.c b/src/wallpaper.c
index db14a8c..ef7ecca 100644
--- a/src/wallpaper.c
+++ b/src/wallpaper.c
@@ -252,7 +252,7 @@ void feh_wm_set_bg(char *fil, Imlib_Image im, int centered, int scaled,
XGCValues gcval;
GC gc;
char bgname[20];
- int num = (int) rand();
+ int num = (int) random();
char bgfil[4096];
char sendbuf[4096];