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#include "common.h"
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/* expand a path relative to some `.' */
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extern String *
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abspath(char *path, char *dot, String *to)
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{
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	if (*path == '/') {
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		to = s_append(to, path);
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	} else {
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		to = s_append(to, dot);
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		to = s_append(to, "/");
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		to = s_append(to, path);
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	}
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	return to;
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}
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/* return a pointer to the base component of a pathname */
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extern char *
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basename(char *path)
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{
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	char *cp;
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	cp = strrchr(path, '/');
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	return cp==0 ? path : cp+1;
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}
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/* append a sub-expression match onto a String */
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extern void
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append_match(Resub *subexp, String *sp, int se)
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{
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	char *cp, *ep;
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	cp = subexp[se].sp;
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	ep = subexp[se].ep;
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	for (; cp < ep; cp++)
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		s_putc(sp, *cp);
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	s_terminate(sp);
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}
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/*
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 *  check for shell characters in a String
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 */
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static char *illegalchars = "\r\n";
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extern int
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shellchars(char *cp)
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{
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	char *sp;
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	for(sp=illegalchars; *sp; sp++)
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		if(strchr(cp, *sp))
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			return 1;
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	return 0;
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}
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static char *specialchars = " ()<>{};=\\'\`^&|";
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static char *escape = "%%";
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int
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hexchar(int x)
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{
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	x &= 0xf;
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	if(x < 10)
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		return '0' + x;
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	else
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		return 'A' + x - 10;
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}
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/*
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 *  rewrite a string to escape shell characters
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 */
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extern String*
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escapespecial(String *s)
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{
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	String *ns;
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	char *sp;
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	for(sp = specialchars; *sp; sp++)
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		if(strchr(s_to_c(s), *sp))
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			break;
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	if(*sp == 0)
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		return s;
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	ns = s_new();
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	for(sp = s_to_c(s); *sp; sp++){
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		if(strchr(specialchars, *sp)){
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			s_append(ns, escape);
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			s_putc(ns, hexchar(*sp>>4));
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			s_putc(ns, hexchar(*sp));
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		} else
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			s_putc(ns, *sp);
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	}
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	s_terminate(ns);
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	s_free(s);
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	return ns;
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}
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int
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hex2uint(char x)
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{
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	if(x >= '0' && x <= '9')
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		return x - '0';
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	if(x >= 'A' && x <= 'F')
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		return (x - 'A') + 10;
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	if(x >= 'a' && x <= 'f')
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		return (x - 'a') + 10;
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	return -512;
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}
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110 
/*
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 *  rewrite a string to remove shell characters escapes
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 */
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extern String*
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unescapespecial(String *s)
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{
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	int c;
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	String *ns;
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	char *sp;
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	uint n;
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121 
	if(strstr(s_to_c(s), escape) == 0)
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		return s;
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	n = strlen(escape);
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	ns = s_new();
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	for(sp = s_to_c(s); *sp; sp++){
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		if(strncmp(sp, escape, n) == 0){
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			c = (hex2uint(sp[n])<<4) | hex2uint(sp[n+1]);
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			if(c < 0)
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				s_putc(ns, *sp);
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			else {
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				s_putc(ns, c);
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				sp += n+2-1;
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			}
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		} else
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			s_putc(ns, *sp);
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	}
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	s_terminate(ns);
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	s_free(s);
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	return ns;
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142 
}
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int
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returnable(char *path)
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{
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148 
	return strcmp(path, "/dev/null") != 0;
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}