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authorAndrew Clayton <ac@sigsegv.uk>2025-03-07 00:07:25 +0000
committerAndrew Clayton <ac@sigsegv.uk>2025-03-07 00:07:25 +0000
commit891c8fbd0c825b6716225e778a8f013afb858d57 (patch)
tree2b98bc47b6db420b10017ca4c0100e6abacd8cc8 /examples
downloadcommon_c_mistakes-master.tar.gz
common_c_mistakes-master.tar.bz2
Initial commitHEADmaster
Signed-off-by: Andrew Clayton <ac@sigsegv.uk>
Diffstat (limited to 'examples')
-rw-r--r--examples/empty-func-args.c4
-rw-r--r--examples/malloc-cast.c4
-rw-r--r--examples/pass-by-value.c41
-rw-r--r--examples/strsep-invalid-free.c16
4 files changed, 65 insertions, 0 deletions
diff --git a/examples/empty-func-args.c b/examples/empty-func-args.c
new file mode 100644
index 0000000..8093c22
--- /dev/null
+++ b/examples/empty-func-args.c
@@ -0,0 +1,4 @@
+void f()
+{
+ /* Do something */
+}
diff --git a/examples/malloc-cast.c b/examples/malloc-cast.c
new file mode 100644
index 0000000..5015147
--- /dev/null
+++ b/examples/malloc-cast.c
@@ -0,0 +1,4 @@
+void f(void)
+{
+ int *vals = malloc(sizeof(int) * 10);
+}
diff --git a/examples/pass-by-value.c b/examples/pass-by-value.c
new file mode 100644
index 0000000..c452591
--- /dev/null
+++ b/examples/pass-by-value.c
@@ -0,0 +1,41 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+struct s {
+ int i;
+};
+
+static void fv(struct s *s)
+{
+ /* Do something with s */
+
+ free(s);
+ s = NULL;
+}
+
+static void fr(struct s **s)
+{
+ /* Do something with s */
+
+ free(*s);
+ *s = NULL;
+}
+
+int main(void)
+{
+ struct s *s;
+
+ s = malloc(sizeof(*s));
+ printf("s: %p\n", s);
+ fv(s);
+ printf("s: %p\n", s);
+
+ printf("\n");
+
+ s = malloc(sizeof(*s));
+ printf("s: %p\n", s);
+ fr(&s);
+ printf("s: %p\n", s);
+
+ return 0;
+}
diff --git a/examples/strsep-invalid-free.c b/examples/strsep-invalid-free.c
new file mode 100644
index 0000000..e01685d
--- /dev/null
+++ b/examples/strsep-invalid-free.c
@@ -0,0 +1,16 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+int main(void)
+{
+ char *str = strdup("Hello World"), *tkn;
+
+ printf("str [%s@%p]\n", str, str);
+ tkn = strsep(&str, " ");
+ printf("tkn [%s] str [%s@%p]\n", tkn, str, str);
+
+ free(str);
+
+ return 0;
+}