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authorMattias Andrée <maandree@kth.se>2024-09-02 18:02:13 +0200
committerMattias Andrée <maandree@kth.se>2024-09-02 18:02:13 +0200
commit6f2ccb15b1599700dc6c9c2388609eccca10a608 (patch)
treed84732290af6e0dfac683eaf2ceea4bd4f7f2493
parentAdd TODO file (diff)
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m + add libsimple_random_bytes
Signed-off-by: Mattias Andrée <maandree@kth.se>
-rw-r--r--Makefile1
-rw-r--r--libsimple/random.h3
-rw-r--r--random_bits.c6
-rw-r--r--random_bytes.c39
4 files changed, 47 insertions, 2 deletions
diff --git a/Makefile b/Makefile
index 4c2f411..95c3340 100644
--- a/Makefile
+++ b/Makefile
@@ -941,6 +941,7 @@ OBJ =\
qsort_ushortp.o\
qsort_ushortp_nul.o\
random_bits.o\
+ random_bytes.o\
random_float.o\
random_signed.o\
random_unsigned.o\
diff --git a/libsimple/random.h b/libsimple/random.h
index 29e3bbf..ecce38c 100644
--- a/libsimple/random.h
+++ b/libsimple/random.h
@@ -31,3 +31,6 @@ uintmax_t libsimple_random_bits(size_t bits, void *unused);
uintmax_t libsimple_random_unsigned(uintmax_t (*rng)(size_t bits, void *user), void *user, uintmax_t min, uintmax_t max);
intmax_t libsimple_random_signed(uintmax_t (*rng)(size_t bits, void *user), void *user, intmax_t min, intmax_t max);
long double libsimple_random_float(uintmax_t (*rng)(size_t bits, void *user), void *user, long double min, long double postmax);
+
+/* TODO doc, man (since 1.7) */
+void *libsimple_random_bytes(uintmax_t (*rng)(size_t bits, void *user), void *user, void *buffer, size_t bytes);
diff --git a/random_bits.c b/random_bits.c
index 528b09e..a6d95a2 100644
--- a/random_bits.c
+++ b/random_bits.c
@@ -14,8 +14,10 @@ libsimple_random_bits(size_t bits, void *unused)
bits -= 8;
}
- ret <<= bits;
- ret |= (uintmax_t)(rand() & ((1 << bits) - 1));
+ if (bits) {
+ ret <<= bits;
+ ret |= (uintmax_t)(rand() & ((1 << bits) - 1));
+ }
(void) unused;
return ret;
diff --git a/random_bytes.c b/random_bytes.c
new file mode 100644
index 0000000..cd7416f
--- /dev/null
+++ b/random_bytes.c
@@ -0,0 +1,39 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+#ifndef TEST
+
+
+void *
+libsimple_random_bytes(uintmax_t (*rng)(size_t bits, void *user), void *user, void *buffer, size_t bytes)
+{
+ char *buf = buffer;
+ uintmax_t rnd;
+
+ while (bytes >= sizeof(uintmax_t)) {
+ *(uintmax_t *)buf = (*rng)(sizeof(uintmax_t) * 8U, user);
+ bytes -= sizeof(uintmax_t);
+ buf = &buf[sizeof(uintmax_t)];
+ }
+
+ if (bytes) {
+ rnd = (*rng)(bytes * 8U, user);
+ while (bytes) {
+ *buf++ = (char)(rnd & 255U);
+ rnd >>= 8;
+ }
+ }
+
+ return buf;
+}
+
+
+#else
+#include "test.h"
+
+int
+main(void)
+{
+ return 0;
+}
+
+#endif