parse: make suggestions for unknown options

[fio.git] / lib / rand.c

diff --git a/lib/rand.c b/lib/rand.c
index 66d04729a49eaa073f822d77a93b66ae426f659d..618a2f06349dbc90389971b8720c9ea067024e28 100644 (file)
--- a/lib/rand.c
+++ b/lib/rand.c
@@ -91,17 +91,49 @@ 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)
 {
-       unsigned int this_len, rep_len;
-       unsigned long r = __rand(fs);
+       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;
+               }
+       }
+}
 
-       assert(segment <= len);
+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 int this_len;
+
+       if (percentage == 100) {
+               if (pbytes)
+                       fill_pattern(buf, len, pattern, pbytes);
+               else
+                       memset(buf, 0, len);
+               return;
+       }
 
-       if (sizeof(int) != sizeof(long *))
-               r *= (unsigned long) __rand(fs);
+       if (segment > len)
+               segment = len;
 
        while (len) {
                /*
@@ -111,22 +143,35 @@ 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;
 
-               /*
-                * Now duplicate random chunk in rest of buf
-                */
-               rep_len = segment - this_len;
-               if (rep_len > len)
-                       rep_len = len;
+               if (this_len > len)
+                       this_len = len;
 
-               memcpy(buf, buf + rep_len, rep_len);
-               buf += rep_len;
-               len -= rep_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;
 }