mirror of https://github.com/yshui/picom.git
81 lines
2.1 KiB
C
81 lines
2.1 KiB
C
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#pragma once
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#include <ctype.h>
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#include <stddef.h>
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#include <stdlib.h>
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static inline const char *
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skip_space_const(const char *src) {
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if (!src)
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return NULL;
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while (*src && isspace(*src))
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src++;
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return src;
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}
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static inline char *
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skip_space_mut(char *src) {
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if (!src)
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return NULL;
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while (*src && isspace(*src))
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src++;
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return src;
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}
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#define skip_space(x) _Generic((x), \
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char *: skip_space_mut, \
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const char *: skip_space_const \
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)(x)
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/// RC_TYPE generates a reference counted type from `type`
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///
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/// parameters:
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/// name = the generated type will be called `name`_t.
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/// ctor = the constructor of `type`, will be called when
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/// a value of `type` is created. should take one
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/// argument of `type *`.
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/// dtor = the destructor. will be called when all reference
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/// is gone. has same signature as ctor
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/// Q = function qualifier. this is the qualifier that
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/// will be put before generated functions
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//
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/// functions generated:
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/// `name`_new: create a new reference counted object of `type`
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/// `name`_ref: increment the reference counter, return a
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/// reference to the object
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/// `name`_unref: decrement the reference counter. take a `type **`
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/// because it needs to nullify the reference.
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#define RC_TYPE(type, name, ctor, dtor, Q) \
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typedef struct { \
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type inner; \
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int ref_count; \
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} name##_internal_t; \
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typedef type name##_t; \
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Q type *name##_new(void) { \
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name##_internal_t *ret = malloc(sizeof(name##_internal_t)); \
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ctor((type *)ret); \
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ret->ref_count = 1; \
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return (type *)ret; \
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} \
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Q type *name##_ref(type *a) { \
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__auto_type b = (name##_internal_t *)a; \
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b->ref_count++; \
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return a; \
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} \
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Q void name##_unref(type **a) { \
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__auto_type b = (name##_internal_t *)*a; \
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if (!b) \
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return; \
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b->ref_count--; \
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if (!b->ref_count) {\
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dtor((type *)b); \
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free(b); \
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} \
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*a = NULL; \
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}
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/// Generate prototypes for functions generated by RC_TYPE
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#define RC_TYPE_PROTO(type, name) \
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typedef type name##_t; \
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type *name##_new(void); \
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void name##_ref(type *a); \
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void name##_unref(type **a);
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