# HG changeset patch
# User pang@apollo5.intellisis
# Date 1270526571 25200
# Node ID 4efb50ce4c9cd44ea8b57fee4614cc867b800402
# Parent  2b95aa9e4e46fe07715294971f4fb4dafcaadbff
rcg.c: expect only one match at a time from regexec()

diff -r 2b95aa9e4e46 -r 4efb50ce4c9c rcg.c
--- a/rcg.c	Tue Mar 30 17:01:04 2010 -0700
+++ b/rcg.c	Mon Apr 05 21:02:51 2010 -0700
@@ -6,7 +6,6 @@
 #include <string.h>
 
 const size_t BUFSIZE = 5000;
-const size_t REMSIZE = 3;
 
 const char *CLR_START = "-CLR_START-";
 const char *CLR_END = "-CLR_END-";
@@ -16,60 +15,60 @@
 	char *buf = calloc(BUFSIZE, sizeof(char));
 
 	regex_t *re = calloc(1, sizeof(regex_t));
-	regcomp(re, "(Hello)", REG_EXTENDED);
+	regcomp(re, "Hello", REG_EXTENDED);
 
-	regmatch_t *rem = calloc(REMSIZE, sizeof(regmatch_t));
+	regmatch_t *rem = calloc(1, sizeof(regmatch_t));
 
 	size_t CLR_START_len = strlen(CLR_START);
 	size_t CLR_END_len = strlen(CLR_END);
 
-	size_t out_len = strlen(buf);
-	if (out_len >= BUFSIZE)
-		out_len = BUFSIZE - 1;
-
-	char *out = calloc(out_len, sizeof(char));
+	char *out = NULL;
 	unsigned int out_pos = 0;
+	unsigned int buf_pos = 0;
 
 	while (fgets(buf, BUFSIZE, stdin))
 	{
-		regexec(re, buf, REMSIZE, rem, 0);
+		int i = 0;
+		int so = -1;
+		int eo = -1;
 
-		int i;
+		do
+		{
+			regexec(re, &buf[buf_pos], 1, rem, 0);
 
-		for (i = 0; i < REMSIZE; i++)
-			fprintf(stderr, "%d %d \n", rem[i].rm_so, rem[i].rm_eo);		//d// 20100327 PBA
+			size_t out_len = strlen(&buf[buf_pos]);
+			if (out_len >= (BUFSIZE - buf_pos))
+				out_len = (BUFSIZE - buf_pos) - 1;
 
-		for (i = 1; i < REMSIZE; i++)
-		{ 
-			int so = rem[i].rm_so;
-			int eo = rem[i].rm_eo;
-			int nso = BUFSIZE;
+			so = rem[0].rm_so;
+			eo = rem[0].rm_eo;
 
-			if ((i + 1) < REMSIZE)
-				nso = rem[i + 1].rm_so; 
-				if (nso == -1)
-					nso = BUFSIZE;
+			fprintf(stderr, "%d %d \n", so, eo);		//d// 20100327 PBA
 
 			if (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)
+				if (i++ == 0)
 				{
-					strncpy(&out[out_pos], buf, so);
+					strncpy(out, buf, 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[so], match_len);
+				strncpy(&out[out_pos], &buf[buf_pos], match_len);
 				out_pos += match_len;
 				strncpy(&out[out_pos], CLR_END, CLR_END_len);
 				out_pos += CLR_END_len;
-				strncpy(&out[out_pos], &buf[eo], nso - eo);
-				out_pos += nso - eo;
+
+				buf_pos += match_len;
 			}
+			else
+				strncpy(&out[out_pos], &buf[eo], out_len - out_pos);
 		}
+		while (so >= 0 && eo >= 0);
 
 		fputs(out, stdout);
 	}