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Õâ¸ö #define stack_push ÊÇÒ»¸öº¯Êý£¬µ÷ÓÃÊÇÕâÑùµÄ

int len;
stack_t *stack;
const char *curpos;
int seglen;
const char *next_slash;
int i;
---------
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if (stack_push(curpos, const char *, stack) < 0 || stack_push(next_slash - curpos + 1, int, stack) < 0)
{
stack_destroy(stack);
return -1;
}


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ʵ¼ÊÉÏÕâ¸öÊǸö±í´ïʽ£¬µ«ÊÇ(elem), Õâ¸öµØ·½£¬¾Í¿´²»Ã÷°×ÁË£¬ÔõÃ´Ìæ»»ºÃÏñ¶¼²»¶Ô¡£¸ßÊÖ°ïÎÒ½âÊÍÒ»ÏÂÕâ¶Î´úÂë°É

#define stack_push(elem, type, stack) \
({ \
(stack)->top + sizeof (type) <= (stack)->base + (stack)->size || \
__stack_expand(stack, sizeof (type)) >= 0 ? \
*((type *)(stack)->top)++ = (elem), (stack)->top - (stack)->base : -1;    \
})


/* Never call the following function directly. */
int __stack_expand(stack_t *stack, unsigned int esize);

Æäʵ¾ÍÊǸö?:±í´ïʽ
?ÅжϵÄÌõ¼þÊÇ(stack)->top + sizeof (type) <= (stack)->base + (stack)->size »òÕß
__stack_expand(stack, sizeof (type)) >= 0

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