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/*
* 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;
}
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