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-rw-r--r--generic/regerror.c82
1 files changed, 82 insertions, 0 deletions
diff --git a/generic/regerror.c b/generic/regerror.c
new file mode 100644
index 0000000..6779e51
--- /dev/null
+++ b/generic/regerror.c
@@ -0,0 +1,82 @@
+/*
+ * regerror - error-code expansion
+ */
+
+#include "regguts.h"
+
+/* unknown-error explanation */
+static char unk[] = "*** unknown regex error code 0x%x ***";
+
+/* struct to map among codes, code names, and explanations */
+static struct rerr {
+ int code;
+ char *name;
+ 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(errcode, preg, errbuf, errbuf_size)
+int errcode; /* 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 */
+{
+ struct rerr *r;
+ char *msg;
+ char convbuf[sizeof(unk)+50]; /* 50 = plenty for int */
+ size_t len;
+ int icode;
+
+ switch (errcode) {
+ 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 == errcode)
+ break;
+ if (r->code >= 0)
+ msg = r->explain;
+ else { /* unknown; say so */
+ sprintf(convbuf, unk, errcode);
+ 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;
+}