regerror.c Go to the documentation of this file. /* * 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 char unk[] = "*** unknown regex error code 0x%x ***"; /* * Struct to map among codes, code names, and explanations. */ static 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 */ { 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: */

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