match.c

这是一个同样来自贝尔实验室的和UNIX有着渊源的操作系统, 其简洁的设计和实现易于我们学习和理解

#include	"mk.h"

int
match(char *name, char *template, char *stem)
{
	Rune r;
	int n;

	while(*name && *template){
		n = chartorune(&r, template);
		if (PERCENT(r))
			break;
		while (n--)
			if(*name++ != *template++)
				return 0;
	}
	if(!PERCENT(*template))
		return 0;
	n = strlen(name)-strlen(template+1);
	if (n < 0)
		return 0;
	if (strcmp(template+1, name+n))
		return 0;
	strncpy(stem, name, n);
	stem[n] = 0;
	if(*template == '&')
		return !charin(stem, "./");
	return 1;
}

void
subst(char *stem, char *template, char *dest, int dlen)
{
	Rune r;
	char *s, *e;
	int n;

	e = dest+dlen-1;
	while(*template){
		n = chartorune(&r, template);
		if (PERCENT(r)) {
			template += n;
			for (s = stem; *s; s++)
				if(dest < e)
					*dest++ = *s;
		} else
			while (n--){
				if(dest < e)
					*dest++ = *template;
				template++;
			}
	}
	*dest = 0;
}