Add `swab`

Make the overlap check pedantic only since some software seems to rely
on glibc working when src and dest are the same.

7 files changed, 110 insertions, 0 deletions

diff --git a/tests/Makefile b/tests/Makefile
index e9e52dc..b4ea242 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -126,6 +126,10 @@ RUNTIME_TARGETS= \
         test_strncpy_static_write    \
         test_strrchr_dynamic_read    \
         test_strrchr_static_read     \
+        test_swab_dynamic_read       \
+        test_swab_dynamic_write      \
+        test_swab_overwrite_over     \
+        test_swab_static_read        \
         test_ttyname_r_dynamic       \
         test_ttyname_r_static        \
         test_umask                   \
diff --git a/tests/test_swab_dynamic_read.c b/tests/test_swab_dynamic_read.c
new file mode 100644
index 0000000..402dc4e
--- /dev/null
+++ b/tests/test_swab_dynamic_read.c
@@ -0,0 +1,18 @@
+#define _XOPEN_SOURCE
+
+#include "common.h"
+
+#include <unistd.h>
+
+int main(int argc, char** argv) {
+  char buffer[12] = {0};
+  swab("1234567890", buffer, sizeof(buffer) - 1);
+  puts(buffer);
+
+  CHK_FAIL_START
+  swab("123456", buffer, argc);
+  CHK_FAIL_END
+
+  puts(buffer);
+  return ret;
+}
diff --git a/tests/test_swab_dynamic_write.c b/tests/test_swab_dynamic_write.c
new file mode 100644
index 0000000..21725b7
--- /dev/null
+++ b/tests/test_swab_dynamic_write.c
@@ -0,0 +1,18 @@
+#define _XOPEN_SOURCE
+
+#include "common.h"
+
+#include <unistd.h>
+
+int main(int argc, char** argv) {
+  char buffer[8] = {0};
+  swab("1234567890", buffer, sizeof(buffer) - 1);
+  puts(buffer);
+
+  CHK_FAIL_START
+  swab("1234567890", buffer, argc);
+  CHK_FAIL_END
+
+  puts(buffer);
+  return ret;
+}
diff --git a/tests/test_swab_overwrite_over.c b/tests/test_swab_overwrite_over.c
new file mode 100644
index 0000000..997f6d1
--- /dev/null
+++ b/tests/test_swab_overwrite_over.c
@@ -0,0 +1,17 @@
+#define _XOPEN_SOURCE
+
+#include "common.h"
+
+#include <unistd.h>
+
+int main(int argc, char** argv) {
+  char buffer[9] = {'A', 'A', 'A', 'A', 'B', 'B', 'B', 'B', '\0'};
+  puts(buffer);
+
+  CHK_FAIL_START
+  swab(buffer+1, buffer, 5);
+  CHK_FAIL_END
+
+  puts(buffer);
+  return ret;
+}
diff --git a/tests/test_swab_overwrite_under.c b/tests/test_swab_overwrite_under.c
new file mode 100644
index 0000000..1d69545
--- /dev/null
+++ b/tests/test_swab_overwrite_under.c
@@ -0,0 +1,17 @@
+#define _XOPEN_SOURCE
+
+#include "common.h"
+
+#include <unistd.h>
+
+int main(int argc, char** argv) {
+  char buffer[9] = {'A', 'A', 'A', 'A', 'B', 'B', 'B', 'B', '\0'};
+  puts(buffer);
+
+  CHK_FAIL_START
+  swab(buffer-1, buffer, 5);
+  CHK_FAIL_END
+
+  puts(buffer);
+  return ret;
+}
diff --git a/tests/test_swab_static_read.c b/tests/test_swab_static_read.c
new file mode 100644
index 0000000..f7fffcb
--- /dev/null
+++ b/tests/test_swab_static_read.c
@@ -0,0 +1,18 @@
+#define _XOPEN_SOURCE
+
+#include "common.h"
+
+#include <unistd.h>
+
+int main(int argc, char** argv) {
+  char buffer[8] = {0};
+  swab("123456", buffer, 4);
+  puts(buffer);
+
+  CHK_FAIL_START
+  swab("123456", buffer, sizeof(buffer));
+  CHK_FAIL_END
+
+  puts(buffer);
+  return ret;
+}
diff --git a/tests/test_swab_static_write.c b/tests/test_swab_static_write.c
new file mode 100644
index 0000000..b5a63c6
--- /dev/null
+++ b/tests/test_swab_static_write.c
@@ -0,0 +1,18 @@
+#define _XOPEN_SOURCE
+
+#include "common.h"
+
+#include <unistd.h>
+
+int main(int argc, char** argv) {
+  char buffer[8] = {0};
+  swab("1234567890", buffer, sizeof(buffer) - 1);
+  puts(buffer);
+
+  CHK_FAIL_START
+  swab("1234567890", buffer, sizeof(buffer) + 1);
+  CHK_FAIL_END
+
+  puts(buffer);
+  return ret;
+}