cmd/expr/compile.c

34  * 	Returns expbuf in dhl format (encoding of first two bytes).
103 compile(const char *instr, char *expbuf, char *endbuf)
105 	return (dhl_compile(instr, expbuf, endbuf));
109 step(const char *instr, const char *expbuf)
111 	return (dhl_step(instr, expbuf));
115 advance(const char *instr, const char *expbuf)
117 	return (dhl_advance(instr, expbuf));
124  * that expbuf[] consists of the following format:
130  * vi. apparently expbuf[0] is set to:
134  * and expbuf[1-35+]	= bitmap of the type of RE chars in the expression.
136  * Here, we use expbuf[0] in a similar fashion; and expbuf[1] is non-zero
141 dhl_compile(instr, expbuf, endbuf)
143 char *expbuf;			/* where the compiled RE gets placed	*/
144 char *endbuf;			/* ending addr of expbuf		*/
157 	 * Check values of expbuf and endbuf
159 	if (expbuf == NULL) {
160 		if ((expbuf = malloc(regexc_size)) == NULL) {
166 		endbuf = expbuf + regexc_size;
168 		if (expbuf + regexc_size > endbuf) {
172 		memcpy(&reg_comp, expbuf, regexc_size);
232 	 * Copy our reg_comp structure to expbuf
234 	(void) memcpy(expbuf, (char *) &reg_comp, regexc_size);
245 			free(expbuf);
251 		return (expbuf);
253 		return (expbuf + regexc_size);