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systemd/coccinelle/memzero.cocci

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licensing: add spdx to our .cocci files Since those are chunks of code based on our codebase, it's easiest to use the same license.
2021-10-01 18:28:36 +08:00
/* SPDX-License-Identifier: LGPL-2.1-or-later */
coccinelle: automatically rewrite memset() to zero() or memzero() where we can We are pretty good at this already, hence only a single case is actually found by this.
2017-12-15 02:47:46 +08:00
@@
expression s;
@@
- memset(&s, 0, sizeof(s))
+ zero(s)
@@
expression s;
@@
- memset(s, 0, sizeof(*s))
+ zero(*s)
@@
expression s;
@@
- bzero(&s, sizeof(s))
+ zero(s)
@@
expression s;
@@
- bzero(s, sizeof(*s))
+ zero(*s)
@@
expression a, b;
@@
coccinelle: ignore macro transformations in the macros themselves For example, the following transformation: - sizeof(s)-1 + STRLEN(s) would replace sizeof by STRLEN even in the STRLEN macro definition itself, which generates following nonsensical patch: --- src/basic/macro.h +++ /tmp/cocci-output-8753-b50773-macro.h @@ -182,7 +182,7 @@ static inline unsigned long ALIGN_POWER2 * Contrary to strlen(), this is a constant expression. * @x: a string literal. */ -#define STRLEN(x) (sizeof(""x"") - 1) +#define STRLEN(x) (STRLEN("" x "")) /* * container_of - cast a member of a structure out to the containing structure Let's exclude the macro itself from the transformation to avoid this
2019-04-28 21:03:47 +08:00
(
#define memzero
&
coccinelle: automatically rewrite memset() to zero() or memzero() where we can We are pretty good at this already, hence only a single case is actually found by this.
2017-12-15 02:47:46 +08:00
- memset(a, 0, b)
+ memzero(a, b)
coccinelle: ignore macro transformations in the macros themselves For example, the following transformation: - sizeof(s)-1 + STRLEN(s) would replace sizeof by STRLEN even in the STRLEN macro definition itself, which generates following nonsensical patch: --- src/basic/macro.h +++ /tmp/cocci-output-8753-b50773-macro.h @@ -182,7 +182,7 @@ static inline unsigned long ALIGN_POWER2 * Contrary to strlen(), this is a constant expression. * @x: a string literal. */ -#define STRLEN(x) (sizeof(""x"") - 1) +#define STRLEN(x) (STRLEN("" x "")) /* * container_of - cast a member of a structure out to the containing structure Let's exclude the macro itself from the transformation to avoid this
2019-04-28 21:03:47 +08:00
)
coccinelle: automatically rewrite memset() to zero() or memzero() where we can We are pretty good at this already, hence only a single case is actually found by this.
2017-12-15 02:47:46 +08:00
@@
expression a, b;
@@
coccinelle: ignore macro transformations in the macros themselves For example, the following transformation: - sizeof(s)-1 + STRLEN(s) would replace sizeof by STRLEN even in the STRLEN macro definition itself, which generates following nonsensical patch: --- src/basic/macro.h +++ /tmp/cocci-output-8753-b50773-macro.h @@ -182,7 +182,7 @@ static inline unsigned long ALIGN_POWER2 * Contrary to strlen(), this is a constant expression. * @x: a string literal. */ -#define STRLEN(x) (sizeof(""x"") - 1) +#define STRLEN(x) (STRLEN("" x "")) /* * container_of - cast a member of a structure out to the containing structure Let's exclude the macro itself from the transformation to avoid this
2019-04-28 21:03:47 +08:00
(
#define memzero
&
coccinelle: automatically rewrite memset() to zero() or memzero() where we can We are pretty good at this already, hence only a single case is actually found by this.
2017-12-15 02:47:46 +08:00
- bzero(a, b)
+ memzero(a, b)
coccinelle: ignore macro transformations in the macros themselves For example, the following transformation: - sizeof(s)-1 + STRLEN(s) would replace sizeof by STRLEN even in the STRLEN macro definition itself, which generates following nonsensical patch: --- src/basic/macro.h +++ /tmp/cocci-output-8753-b50773-macro.h @@ -182,7 +182,7 @@ static inline unsigned long ALIGN_POWER2 * Contrary to strlen(), this is a constant expression. * @x: a string literal. */ -#define STRLEN(x) (sizeof(""x"") - 1) +#define STRLEN(x) (STRLEN("" x "")) /* * container_of - cast a member of a structure out to the containing structure Let's exclude the macro itself from the transformation to avoid this
2019-04-28 21:03:47 +08:00
)
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