1 files changed, 126 insertions, 0 deletions
diff --git a/regex/regerror.c b/regex/regerror.c
new file mode 100644
index 0000000..b9238c8
--- /dev/null
+++ b/regex/regerror.c
@@ -0,0 +1,126 @@
+#include <sys/types.h>
+#include <stdio.h>
+#include <string.h>
+#include <ctype.h>
+#include <limits.h>
+#include <stdlib.h>
+#include <regex.h>
+
+#include "utils.h"
+#include "regerror.ih"
+
+/*
+ = #define	REG_OKAY	 0
+ = #define	REG_NOMATCH	 1
+ = #define	REG_BADPAT	 2
+ = #define	REG_ECOLLATE	 3
+ = #define	REG_ECTYPE	 4
+ = #define	REG_EESCAPE	 5
+ = #define	REG_ESUBREG	 6
+ = #define	REG_EBRACK	 7
+ = #define	REG_EPAREN	 8
+ = #define	REG_EBRACE	 9
+ = #define	REG_BADBR	10
+ = #define	REG_ERANGE	11
+ = #define	REG_ESPACE	12
+ = #define	REG_BADRPT	13
+ = #define	REG_EMPTY	14
+ = #define	REG_ASSERT	15
+ = #define	REG_INVARG	16
+ = #define	REG_ATOI	255	// convert name to number (!)
+ = #define	REG_ITOA	0400	// convert number to name (!)
+ */
+static struct rerr {
+	int code;
+	char *name;
+	char *explain;
+} rerrs[] = {
+	{REG_OKAY,	"REG_OKAY",	"no errors detected"},
+	{REG_NOMATCH,	"REG_NOMATCH",	"regexec() failed to match"},
+	{REG_BADPAT,	"REG_BADPAT",	"invalid regular expression"},
+	{REG_ECOLLATE,	"REG_ECOLLATE",	"invalid collating element"},
+	{REG_ECTYPE,	"REG_ECTYPE",	"invalid character class"},
+	{REG_EESCAPE,	"REG_EESCAPE",	"trailing backslash (\\)"},
+	{REG_ESUBREG,	"REG_ESUBREG",	"invalid backreference number"},
+	{REG_EBRACK,	"REG_EBRACK",	"brackets ([ ]) not balanced"},
+	{REG_EPAREN,	"REG_EPAREN",	"parentheses not balanced"},
+	{REG_EBRACE,	"REG_EBRACE",	"braces not balanced"},
+	{REG_BADBR,	"REG_BADBR",	"invalid repetition count(s)"},
+	{REG_ERANGE,	"REG_ERANGE",	"invalid character range"},
+	{REG_ESPACE,	"REG_ESPACE",	"out of memory"},
+	{REG_BADRPT,	"REG_BADRPT",	"repetition-operator operand invalid"},
+	{REG_EMPTY,	"REG_EMPTY",	"empty (sub)expression"},
+	{REG_ASSERT,	"REG_ASSERT",	"\"can't happen\" -- you found a bug"},
+	{REG_INVARG,	"REG_INVARG",	"invalid argument to regex routine"},
+	{-1,		"",		"*** unknown regexp error code ***"}
+};
+
+/*
+ - regerror - the interface to error numbers
+ = extern size_t notbuiltin_regerror(int, const regex_t *, char *, size_t);
+ */
+/* ARGSUSED */
+size_t
+notbuiltin_regerror(errcode, preg, errbuf, errbuf_size)
+int errcode;
+const regex_t *preg;
+char *errbuf;
+size_t errbuf_size;
+{
+	register struct rerr *r;
+	register size_t len;
+	register int target = errcode &~ REG_ITOA;
+	register char *s;
+	char convbuf[50];
+
+	if (errcode == REG_ATOI)
+		s = regatoi(preg, convbuf);
+	else {
+		for (r = rerrs; r->code >= 0; r++)
+			if (r->code == target)
+				break;
+	
+		if (errcode&REG_ITOA) {
+			if (r->code >= 0)
+				(void) strcpy(convbuf, r->name);
+			else
+				sprintf(convbuf, "REG_0x%x", target);
+			assert(strlen(convbuf) < sizeof(convbuf));
+			s = convbuf;
+		} else
+			s = r->explain;
+	}
+
+	len = strlen(s) + 1;
+	if (errbuf_size > 0) {
+		if (errbuf_size > len)
+			(void) strcpy(errbuf, s);
+		else {
+			(void) strncpy(errbuf, s, errbuf_size-1);
+			errbuf[errbuf_size-1] = '\0';
+		}
+	}
+
+	return(len);
+}
+
+/*
+ - regatoi - internal routine to implement REG_ATOI
+ == static char *regatoi(const regex_t *preg, char *localbuf);
+ */
+static char *
+regatoi(preg, localbuf)
+const regex_t *preg;
+char *localbuf;
+{
+	register struct rerr *r;
+
+	for (r = rerrs; r->code >= 0; r++)
+		if (strcmp(r->name, preg->re_endp) == 0)
+			break;
+	if (r->code < 0)
+		return("0");
+
+	sprintf(localbuf, "%d", r->code);
+	return(localbuf);
+}