parse: make suggestions for unknown options

[fio.git] / lib / rand.c

diff --git a/lib/rand.c b/lib/rand.c
index a79fb9c17c321a94e8e4bcfe030193003c80d93f..618a2f06349dbc90389971b8720c9ea067024e28 100644 (file)
--- a/lib/rand.c
+++ b/lib/rand.c
@@ -34,6 +34,7 @@
 */
 
 #include <string.h>
+#include <assert.h>
 #include "rand.h"
 #include "../hash.h"
 
@@ -90,24 +91,50 @@ unsigned long fill_random_buf(struct frand_state *fs, void *buf,
        return r;
 }
 
-unsigned long fill_random_buf_percentage(struct frand_state *fs, void *buf,
-                                        unsigned int percentage,
-                                        unsigned int segment, unsigned int len)
+void fill_pattern(void *p, unsigned int len, char *pattern,
+                 unsigned int pattern_bytes)
+{
+       switch (pattern_bytes) {
+       case 0:
+               assert(0);
+               break;
+       case 1:
+               memset(p, pattern[0], len);
+               break;
+       default: {
+               unsigned int i = 0, size = 0;
+               unsigned char *b = p;
+
+               while (i < len) {
+                       size = pattern_bytes;
+                       if (size > (len - i))
+                               size = len - i;
+                       memcpy(b+i, pattern, size);
+                       i += size;
+               }
+               break;
+               }
+       }
+}
+
+void __fill_random_buf_percentage(unsigned long seed, void *buf,
+                                 unsigned int percentage,
+                                 unsigned int segment, unsigned int len,
+                                 char *pattern, unsigned int pbytes)
 {
-       unsigned long r = __rand(fs);
        unsigned int this_len;
 
        if (percentage == 100) {
-               memset(buf, 0, len);
-               return 0;
+               if (pbytes)
+                       fill_pattern(buf, len, pattern, pbytes);
+               else
+                       memset(buf, 0, len);
+               return;
        }
 
        if (segment > len)
                segment = len;
 
-       if (sizeof(int) != sizeof(long *))
-               r *= (unsigned long) __rand(fs);
-
        while (len) {
                /*
                 * Fill random chunk
@@ -116,7 +143,7 @@ unsigned long fill_random_buf_percentage(struct frand_state *fs, void *buf,
                if (this_len > len)
                        this_len = len;
 
-               __fill_random_buf(buf, this_len, r);
+               __fill_random_buf(buf, this_len, seed);
 
                len -= this_len;
                buf += this_len;
@@ -124,10 +151,27 @@ unsigned long fill_random_buf_percentage(struct frand_state *fs, void *buf,
                if (this_len > len)
                        this_len = len;
 
-               memset(buf, 0, this_len);
+               if (pbytes)
+                       fill_pattern(buf, this_len, pattern, pbytes);
+               else
+                       memset(buf, 0, this_len);
+
                len -= this_len;
                buf += this_len;
        }
+}
+
+unsigned long fill_random_buf_percentage(struct frand_state *fs, void *buf,
+                                        unsigned int percentage,
+                                        unsigned int segment, unsigned int len,
+                                        char *pattern, unsigned int pbytes)
+{
+       unsigned long r = __rand(fs);
+
+       if (sizeof(int) != sizeof(long *))
+               r *= (unsigned long) __rand(fs);
 
+       __fill_random_buf_percentage(r, buf, percentage, segment, len,
+                                       pattern, pbytes);
        return r;
 }