1 files changed, 129 insertions, 0 deletions
diff --git a/generic/regerror.c b/generic/regerror.c
new file mode 100644
index 0000000..49d93ed
--- /dev/null
+++ b/generic/regerror.c
@@ -0,0 +1,129 @@
+/*
+ * regerror - error-code expansion
+ *
+ * Copyright (c) 1998, 1999 Henry Spencer.  All rights reserved.
+ *
+ * Development of this software was funded, in part, by Cray Research Inc.,
+ * UUNET Communications Services Inc., Sun Microsystems Inc., and Scriptics
+ * Corporation, none of whom are responsible for the results.  The author
+ * thanks all of them.
+ *
+ * Redistribution and use in source and binary forms -- with or without
+ * modification -- are permitted for any purpose, provided that
+ * redistributions in source form retain this entire copyright notice and
+ * indicate the origin and nature of any modifications.
+ *
+ * I'd appreciate being given credit for this package in the documentation of
+ * software which uses it, but that is not a requirement.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
+ * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
+ * HENRY SPENCER BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include "regguts.h"
+
+/*
+ * Unknown-error explanation.
+ */
+
+static const char unk[] = "*** unknown regex error code 0x%x ***";
+
+/*
+ * Struct to map among codes, code names, and explanations.
+ */
+
+static const struct rerr {
+    int code;
+    const char *name;
+    const char *explain;
+} rerrs[] = {
+    /* The actual table is built from regex.h */
+#include "regerrs.h"
+    { -1, "", "oops" },		/* explanation special-cased in code */
+};
+
+/*
+ - regerror - the interface to error numbers
+ */
+/* ARGSUSED */
+size_t				/* Actual space needed (including NUL) */
+regerror(
+    int code,			/* Error code, or REG_ATOI or REG_ITOA */
+    const regex_t *preg,	/* Associated regex_t (unused at present) */
+    char *errbuf,		/* Result buffer (unless errbuf_size==0) */
+    size_t errbuf_size)		/* Available space in errbuf, can be 0 */
+{
+    const struct rerr *r;
+    const char *msg;
+    char convbuf[sizeof(unk)+50]; /* 50 = plenty for int */
+    size_t len;
+    int icode;
+
+    switch (code) {
+    case REG_ATOI:		/* Convert name to number */
+	for (r = rerrs; r->code >= 0; r++) {
+	    if (strcmp(r->name, errbuf) == 0) {
+		break;
+	    }
+	}
+	sprintf(convbuf, "%d", r->code); /* -1 for unknown */
+	msg = convbuf;
+	break;
+    case REG_ITOA:		/* Convert number to name */
+	icode = atoi(errbuf);	/* Not our problem if this fails */
+	for (r = rerrs; r->code >= 0; r++) {
+	    if (r->code == icode) {
+		break;
+	    }
+	}
+	if (r->code >= 0) {
+	    msg = r->name;
+	} else {		/* Unknown; tell him the number */
+	    sprintf(convbuf, "REG_%u", (unsigned)icode);
+	    msg = convbuf;
+	}
+	break;
+    default:			/* A real, normal error code */
+	for (r = rerrs; r->code >= 0; r++) {
+	    if (r->code == code) {
+		break;
+	    }
+	}
+	if (r->code >= 0) {
+	    msg = r->explain;
+	} else {		/* Unknown; say so */
+	    sprintf(convbuf, unk, code);
+	    msg = convbuf;
+	}
+	break;
+    }
+
+    len = strlen(msg) + 1;	/* Space needed, including NUL */
+    if (errbuf_size > 0) {
+	if (errbuf_size > len) {
+	    strcpy(errbuf, msg);
+	} else {		/* Truncate to fit */
+	    strncpy(errbuf, msg, errbuf_size-1);
+	    errbuf[errbuf_size-1] = '\0';
+	}
+    }
+
+    return len;
+}
+
+/*
+ * Local Variables:
+ * mode: c
+ * c-basic-offset: 4
+ * fill-column: 78
+ * End:
+ */