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      1 /* $NetBSD: signalnumber.c,v 1.3 2020/08/20 22:56:56 kre Exp $ */
      2 
      3 /*
      4  * Software available to all and sundry without limitations
      5  * but without warranty of fitness for any purpose whatever.
      6  *
      7  * Licensed for any use, including redistribution in source
      8  * and binary forms, with or without modifications, subject
      9  * the following agreement:
     10  *
     11  * Licensee agrees to indemnify licensor, and distributor, for
     12  * the full amount of any any claim made by the licensee against
     13  * the licensor or distributor, for any action that results from
     14  * any use or redistribution of this software, plus any costs
     15  * incurred by licensor or distributor resulting from that claim.
     16  *
     17  * This licence must be retained with the software.
     18  */
     19 
     20 #include "namespace.h"
     21 
     22 #include <signal.h>
     23 #include <stdlib.h>
     24 #include <string.h>
     25 #include <ctype.h>
     26 
     27 /*
     28  * signalnumber()
     29  *
     30  *	Converts the signal named "name" to its
     31  *	signal number.
     32  *
     33  *	"name" can be the signal name with or without
     34  *	the leading "SIG" prefix, and character comparisons
     35  *	are done in a case independent manner.
     36  *	(ie: SIGINT == INT == int == Int == SiGiNt == (etc).)
     37  *
     38  * Returns:
     39  *	0 on error (invalid signal name)
     40  *	otherwise the signal number that corresponds to "name"
     41  */
     42 
     43 int
     44 signalnumber(const char *name)
     45 {
     46 	int i;
     47 #ifndef SMALL
     48 	long offs;
     49 	char *ep;
     50 #endif
     51 
     52 	if (strncasecmp(name, "sig", 3) == 0)
     53 		name += 3;
     54 
     55 	for (i = 1; i < NSIG; ++i)
     56 		if (sys_signame[i] != NULL &&
     57 		    strcasecmp(name, sys_signame[i]) == 0)
     58 			return i;
     59 
     60 #ifndef SMALL
     61 	if (strncasecmp(name, "rtm", 3) == 0) {
     62 		name += 3;
     63 		if (strncasecmp(name, "ax", 2) == 0)
     64 			i = SIGRTMAX;
     65 		else if (strncasecmp(name, "in", 2) == 0)
     66 			i = SIGRTMIN;
     67 		else
     68 			return 0;
     69 		name += 2;
     70 		if (name[0] == '\0')
     71 			return i;
     72 		if (i == SIGRTMAX && name[0] != '-')
     73 			return 0;
     74 		if (i == SIGRTMIN && name[0] != '+')
     75 			return 0;
     76 		if (!isdigit((unsigned char)name[1]))
     77 			return 0;
     78 		offs = strtol(name+1, &ep, 10);
     79 		if (ep == name+1 || *ep != '\0' ||
     80 		    offs < 0 || offs > SIGRTMAX-SIGRTMIN)
     81 			return 0;
     82 		if (name[0] == '+')
     83 			i += (int)offs;
     84 		else
     85 			i -= (int)offs;
     86 		if (i >= SIGRTMIN && i <= SIGRTMAX)
     87 			return i;
     88 	}
     89 #endif
     90 	return 0;
     91 }
     92