# HG changeset patch
# User paulo@twcdns.fastsearch.net
# Date 1270532257 25200
# Node ID fe4b316b43860c30f27b4f653e81902f4f0321fc
# Parent  4efb50ce4c9cd44ea8b57fee4614cc867b800402
rcg.c: working multiple regexec matches; couple of error handling functions

diff -r 4efb50ce4c9c -r fe4b316b4386 rcg.c
--- a/rcg.c	Mon Apr 05 21:02:51 2010 -0700
+++ b/rcg.c	Mon Apr 05 22:37:37 2010 -0700
@@ -10,52 +10,71 @@
 const char *CLR_START = "-CLR_START-";
 const char *CLR_END = "-CLR_END-";
 
+int re_error(int errcode, const regex_t *re)
+{
+	char *err_string = calloc(BUFSIZE, sizeof(char));
+	regerror(errcode, re, err_string, BUFSIZE*sizeof(char));
+	fprintf(stderr, "%s \n", err_string);
+	free(err_string);
+	return errcode;
+}
+
+int realloc_error()
+{
+	fprintf(stderr, "realloc() failure \n");
+	return 1;
+}
+
 int main(int argc, char **argv)
 {
 	char *buf = calloc(BUFSIZE, sizeof(char));
 
+	int re_err;
 	regex_t *re = calloc(1, sizeof(regex_t));
-	regcomp(re, "Hello", REG_EXTENDED);
+	re_err = regcomp(re, "Hello", REG_EXTENDED);
+	if (re_err != 0)
+		exit(re_error(re_err, re));
 
 	regmatch_t *rem = calloc(1, sizeof(regmatch_t));
 
 	size_t CLR_START_len = strlen(CLR_START);
 	size_t CLR_END_len = strlen(CLR_END);
 
-	char *out = NULL;
-	unsigned int out_pos = 0;
-	unsigned int buf_pos = 0;
 
 	while (fgets(buf, BUFSIZE, stdin))
 	{
-		int i = 0;
 		int so = -1;
 		int eo = -1;
 
-		do
+		size_t out_len = strlen(buf);
+		char *out = calloc(out_len, sizeof(char));
+		unsigned int out_pos = 0;
+		unsigned int buf_pos = 0;
+
+		while (re_err != REG_NOMATCH)
 		{
-			regexec(re, &buf[buf_pos], 1, rem, 0);
+			re_err = regexec(re, &buf[buf_pos], 1, rem, 0);
 
-			size_t out_len = strlen(&buf[buf_pos]);
+			//fprintf(stderr, "%s", &buf[buf_pos]);		//d// 20100405 PBA
+
 			if (out_len >= (BUFSIZE - buf_pos))
 				out_len = (BUFSIZE - buf_pos) - 1;
 
 			so = rem[0].rm_so;
 			eo = rem[0].rm_eo;
 
-			fprintf(stderr, "%d %d \n", so, eo);		//d// 20100327 PBA
+			//fprintf(stderr, "%d %d \n", so, eo);		//d// 20100327 PBA
 
-			if (so >= 0 && eo >= 0)
+			if (re_err != REG_NOMATCH && so >= 0 && eo >= 0)
 			{
 				int match_len = eo - so;
 				out_len += CLR_START_len + CLR_END_len;
 				out = (char *)realloc(out, out_len*sizeof(char));
-				if (i++ == 0)
-				{
-					strncpy(out, buf, so);
-					out_pos += so;
-					buf_pos += so;
-				}
+				if (!out)
+					exit(realloc_error());
+				strncpy(&out[out_pos], &buf[buf_pos], so);
+				out_pos += so;
+				buf_pos += so;
 				strncpy(&out[out_pos], CLR_START, CLR_START_len);
 				out_pos += CLR_START_len;
 				strncpy(&out[out_pos], &buf[buf_pos], match_len);
@@ -66,11 +85,11 @@
 				buf_pos += match_len;
 			}
 			else
-				strncpy(&out[out_pos], &buf[eo], out_len - out_pos);
+				strncpy(&out[out_pos], &buf[buf_pos], out_len - out_pos);
 		}
-		while (so >= 0 && eo >= 0);
 
 		fputs(out, stdout);
+		free(out);
 	}
 
 	return 0;