/* $Header: util.c,v 3.0 89/10/18 15:32:43 lwall Locked $ * * Copyright (c) 1989, Larry Wall * * You may distribute under the terms of the GNU General Public License * as specified in the README file that comes with the perl 3.0 kit. * * $Log: util.c,v $ * Revision 3.0 89/10/18 15:32:43 lwall * 3.0 baseline * */ #include "EXTERN.h" #include "perl.h" #include "errno.h" #include #ifdef I_VFORK # include #endif #ifdef I_VARARGS # include #endif #define FLUSH static char nomem[] = "Out of memory!\n"; /* paranoid version of malloc */ #ifdef DEBUGGING static int an = 0; #endif /* NOTE: Do not call the next three routines directly. Use the macros * in handy.h, so that we can easily redefine everything to do tracking of * allocated hunks back to the original New to track down any memory leaks. */ char * safemalloc(size) MEM_SIZE size; { char *ptr; char *malloc(); ptr = malloc(size?size:1); /* malloc(0) is NASTY on our system */ #ifdef DEBUGGING # ifndef I286 if (debug & 128) fprintf(stderr,"0x%x: (%05d) malloc %d bytes\n",ptr,an++,size); # else if (debug & 128) fprintf(stderr,"0x%lx: (%05d) malloc %d bytes\n",ptr,an++,size); # endif #endif if (ptr != Nullch) return ptr; else { fputs(nomem,stdout) FLUSH; exit(1); } /*NOTREACHED*/ #ifdef lint return ptr; #endif } /* paranoid version of realloc */ char * saferealloc(where,size) char *where; MEM_SIZE size; { char *ptr; char *realloc(); if (!where) fatal("Null realloc"); ptr = realloc(where,size?size:1); /* realloc(0) is NASTY on our system */ #ifdef DEBUGGING # ifndef I286 if (debug & 128) { fprintf(stderr,"0x%x: (%05d) rfree\n",where,an++); fprintf(stderr,"0x%x: (%05d) realloc %d bytes\n",ptr,an++,size); } # else if (debug & 128) { fprintf(stderr,"0x%lx: (%05d) rfree\n",where,an++); fprintf(stderr,"0x%lx: (%05d) realloc %d bytes\n",ptr,an++,size); } # endif #endif if (ptr != Nullch) return ptr; else { fputs(nomem,stdout) FLUSH; exit(1); } /*NOTREACHED*/ #ifdef lint return ptr; #endif } /* safe version of free */ void safefree(where) char *where; { #ifdef DEBUGGING # ifndef I286 if (debug & 128) fprintf(stderr,"0x%x: (%05d) free\n",where,an++); # else if (debug & 128) fprintf(stderr,"0x%lx: (%05d) free\n",where,an++); # endif #endif if (where) { free(where); } } #ifdef LEAKTEST #define ALIGN sizeof(long) char * safexmalloc(x,size) int x; MEM_SIZE size; { register char *where; where = safemalloc(size + ALIGN); xcount[x]++; where[0] = x % 100; where[1] = x / 100; return where + ALIGN; } char * safexrealloc(where,size) char *where; MEM_SIZE size; { return saferealloc(where - ALIGN, size + ALIGN) + ALIGN; } void safexfree(where) char *where; { int x; if (!where) return; where -= ALIGN; x = where[0] + 100 * where[1]; xcount[x]--; safefree(where); } xstat() { register int i; for (i = 0; i < MAXXCOUNT; i++) { if (xcount[i] != lastxcount[i]) { fprintf(stderr,"%2d %2d\t%ld\n", i / 100, i % 100, xcount[i]); lastxcount[i] = xcount[i]; } } } #endif /* LEAKTEST */ /* copy a string up to some (non-backslashed) delimiter, if any */ char * cpytill(to,from,fromend,delim,retlen) register char *to, *from; register char *fromend; register int delim; int *retlen; { char *origto = to; for (; from < fromend; from++,to++) { if (*from == '\\') { if (from[1] == delim) from++; else if (from[1] == '\\') *to++ = *from++; } else if (*from == delim) break; *to = *from; } *to = '\0'; *retlen = to - origto; return from; } /* return ptr to little string in big string, NULL if not found */ /* This routine was donated by Corey Satten. */ char * instr(big, little) register char *big; register char *little; { register char *s, *x; register int first; if (!little) return big; first = *little++; if (!first) return big; while (*big) { if (*big++ != first) continue; for (x=big,s=little; *s; /**/ ) { if (!*x) return Nullch; if (*s++ != *x++) { s--; break; } } if (!*s) return big-1; } return Nullch; } /* same as instr but allow embedded nulls */ char * ninstr(big, bigend, little, lend) register char *big; register char *bigend; char *little; char *lend; { register char *s, *x; register int first = *little; register char *littleend = lend; if (!first && little > littleend) return big; bigend -= littleend - little++; while (big <= bigend) { if (*big++ != first) continue; for (x=big,s=little; s < littleend; /**/ ) { if (*s++ != *x++) { s--; break; } } if (s >= littleend) return big-1; } return Nullch; } /* reverse of the above--find last substring */ char * rninstr(big, bigend, little, lend) register char *big; char *bigend; char *little; char *lend; { register char *bigbeg; register char *s, *x; register int first = *little; register char *littleend = lend; if (!first && little > littleend) return bigend; bigbeg = big; big = bigend - (littleend - little++); while (big >= bigbeg) { if (*big-- != first) continue; for (x=big+2,s=little; s < littleend; /**/ ) { if (*s++ != *x++) { s--; break; } } if (s >= littleend) return big+1; } return Nullch; } unsigned char fold[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', 91, 92, 93, 94, 95, 96, 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191, 192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207, 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223, 224, 225, 226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246, 247, 248, 249, 250, 251, 252, 253, 254, 255 }; static unsigned char freq[] = { 1, 2, 84, 151, 154, 155, 156, 157, 165, 246, 250, 3, 158, 7, 18, 29, 40, 51, 62, 73, 85, 96, 107, 118, 129, 140, 147, 148, 149, 150, 152, 153, 255, 182, 224, 205, 174, 176, 180, 217, 233, 232, 236, 187, 235, 228, 234, 226, 222, 219, 211, 195, 188, 193, 185, 184, 191, 183, 201, 229, 181, 220, 194, 162, 163, 208, 186, 202, 200, 218, 198, 179, 178, 214, 166, 170, 207, 199, 209, 206, 204, 160, 212, 216, 215, 192, 175, 173, 243, 172, 161, 190, 203, 189, 164, 230, 167, 248, 227, 244, 242, 255, 241, 231, 240, 253, 169, 210, 245, 237, 249, 247, 239, 168, 252, 251, 254, 238, 223, 221, 213, 225, 177, 197, 171, 196, 159, 4, 5, 6, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 141, 142, 143, 144, 145, 146 }; void fbmcompile(str, iflag) STR *str; int iflag; { register unsigned char *s; register unsigned char *table; register int i; register int len = str->str_cur; int rarest = 0; int frequency = 256; str_grow(str,len+258); #ifndef lint table = (unsigned char*)(str->str_ptr + len + 1); #else table = Null(unsigned char*); #endif s = table - 2; for (i = 0; i < 256; i++) { table[i] = len; } i = 0; #ifndef lint while (s >= (unsigned char*)(str->str_ptr)) #endif { if (table[*s] == len) { #ifndef pdp11 if (iflag) table[*s] = table[fold[*s]] = i; #else if (iflag) { int j; j = fold[*s]; table[j] = i; table[*s] = i; } #endif /* pdp11 */ else table[*s] = i; } s--,i++; } str->str_pok |= SP_FBM; /* deep magic */ #ifndef lint s = (unsigned char*)(str->str_ptr); /* deeper magic */ #else s = Null(unsigned char*); #endif if (iflag) { register int tmp, foldtmp; str->str_pok |= SP_CASEFOLD; for (i = 0; i < len; i++) { tmp=freq[s[i]]; foldtmp=freq[fold[s[i]]]; if (tmp < frequency && foldtmp < frequency) { rarest = i; /* choose most frequent among the two */ frequency = (tmp > foldtmp) ? tmp : foldtmp; } } } else { for (i = 0; i < len; i++) { if (freq[s[i]] < frequency) { rarest = i; frequency = freq[s[i]]; } } } str->str_rare = s[rarest]; str->str_state = rarest; #ifdef DEBUGGING if (debug & 512) fprintf(stderr,"rarest char %c at %d\n",str->str_rare, str->str_state); #endif } char * fbminstr(big, bigend, littlestr) unsigned char *big; register unsigned char *bigend; STR *littlestr; { register unsigned char *s; register int tmp; register int littlelen; register unsigned char *little; register unsigned char *table; register unsigned char *olds; register unsigned char *oldlittle; #ifndef lint if (!(littlestr->str_pok & SP_FBM)) return instr((char*)big,littlestr->str_ptr); #endif littlelen = littlestr->str_cur; #ifndef lint if (littlestr->str_pok & SP_TAIL && !multiline) { /* tail anchored? */ little = (unsigned char*)littlestr->str_ptr; if (littlestr->str_pok & SP_CASEFOLD) { /* oops, fake it */ big = bigend - littlelen; /* just start near end */ if (bigend[-1] == '\n' && little[littlelen-1] != '\n') big--; } else { s = bigend - littlelen; if (*s == *little && bcmp(s,little,littlelen)==0) return (char*)s; /* how sweet it is */ else if (bigend[-1] == '\n' && little[littlelen-1] != '\n') { s--; if (*s == *little && bcmp(s,little,littlelen)==0) return (char*)s; } return Nullch; } } table = (unsigned char*)(littlestr->str_ptr + littlelen + 1); #else table = Null(unsigned char*); #endif s = big + --littlelen; oldlittle = little = table - 2; if (littlestr->str_pok & SP_CASEFOLD) { /* case insensitive? */ while (s < bigend) { top1: if (tmp = table[*s]) { s += tmp; } else { tmp = littlelen; /* less expensive than calling strncmp() */ olds = s; while (tmp--) { if (*--s == *--little || fold[*s] == *little) continue; s = olds + 1; /* here we pay the price for failure */ little = oldlittle; if (s < bigend) /* fake up continue to outer loop */ goto top1; return Nullch; } #ifndef lint return (char *)s; #endif } } } else { while (s < bigend) { top2: if (tmp = table[*s]) { s += tmp; } else { tmp = littlelen; /* less expensive than calling strncmp() */ olds = s; while (tmp--) { if (*--s == *--little) continue; s = olds + 1; /* here we pay the price for failure */ little = oldlittle; if (s < bigend) /* fake up continue to outer loop */ goto top2; return Nullch; } #ifndef lint return (char *)s; #endif } } } return Nullch; } char * screaminstr(bigstr, littlestr) STR *bigstr; STR *littlestr; { register unsigned char *s, *x; register unsigned char *big; register int pos; register int previous; register int first; register unsigned char *little; register unsigned char *bigend; register unsigned char *littleend; if ((pos = screamfirst[littlestr->str_rare]) < 0) return Nullch; #ifndef lint little = (unsigned char *)(littlestr->str_ptr); #else little = Null(unsigned char *); #endif littleend = little + littlestr->str_cur; first = *little++; previous = littlestr->str_state; #ifndef lint big = (unsigned char *)(bigstr->str_ptr); #else big = Null(unsigned char*); #endif bigend = big + bigstr->str_cur; big -= previous; while (pos < previous) { #ifndef lint if (!(pos += screamnext[pos])) #endif return Nullch; } if (littlestr->str_pok & SP_CASEFOLD) { /* case insignificant? */ do { if (big[pos] != first && big[pos] != fold[first]) continue; for (x=big+pos+1,s=little; s < littleend; /**/ ) { if (x >= bigend) return Nullch; if (*s++ != *x++ && fold[*(s-1)] != *(x-1)) { s--; break; } } if (s == littleend) #ifndef lint return (char *)(big+pos); #else return Nullch; #endif } while ( #ifndef lint pos += screamnext[pos] /* does this goof up anywhere? */ #else pos += screamnext[0] #endif ); } else { do { if (big[pos] != first) continue; for (x=big+pos+1,s=little; s < littleend; /**/ ) { if (x >= bigend) return Nullch; if (*s++ != *x++) { s--; break; } } if (s == littleend) #ifndef lint return (char *)(big+pos); #else return Nullch; #endif } while ( #ifndef lint pos += screamnext[pos] #else pos += screamnext[0] #endif ); } return Nullch; } /* copy a string to a safe spot */ char * savestr(str) char *str; { register char *newaddr; New(902,newaddr,strlen(str)+1,char); (void)strcpy(newaddr,str); return newaddr; } /* same thing but with a known length */ char * nsavestr(str, len) char *str; register int len; { register char *newaddr; New(903,newaddr,len+1,char); (void)bcopy(str,newaddr,len); /* might not be null terminated */ newaddr[len] = '\0'; /* is now */ return newaddr; } /* grow a static string to at least a certain length */ void growstr(strptr,curlen,newlen) char **strptr; int *curlen; int newlen; { if (newlen > *curlen) { /* need more room? */ if (*curlen) Renew(*strptr,newlen,char); else New(905,*strptr,newlen,char); *curlen = newlen; } } extern int errno; #ifndef VARARGS /*VARARGS1*/ mess(pat,a1,a2,a3,a4) char *pat; long a1, a2, a3, a4; { char *s; s = buf; (void)sprintf(s,pat,a1,a2,a3,a4); s += strlen(s); if (s[-1] != '\n') { if (line) { (void)sprintf(s," at %s line %ld", in_eval?filename:origfilename, (long)line); s += strlen(s); } if (last_in_stab && stab_io(last_in_stab) && stab_io(last_in_stab)->lines ) { (void)sprintf(s,", <%s> line %ld", last_in_stab == argvstab ? "" : stab_name(last_in_stab), (long)stab_io(last_in_stab)->lines); s += strlen(s); } (void)strcpy(s,".\n"); } } /*VARARGS1*/ fatal(pat,a1,a2,a3,a4) char *pat; long a1, a2, a3, a4; { extern FILE *e_fp; extern char *e_tmpname; mess(pat,a1,a2,a3,a4); if (in_eval) { str_set(stab_val(stabent("@",TRUE)),buf); longjmp(eval_env,1); } fputs(buf,stderr); (void)fflush(stderr); if (e_fp) (void)UNLINK(e_tmpname); statusvalue >>= 8; exit(errno?errno:(statusvalue?statusvalue:255)); } /*VARARGS1*/ warn(pat,a1,a2,a3,a4) char *pat; long a1, a2, a3, a4; { mess(pat,a1,a2,a3,a4); fputs(buf,stderr); #ifdef LEAKTEST #ifdef DEBUGGING if (debug & 4096) xstat(); #endif #endif (void)fflush(stderr); } #else /*VARARGS0*/ mess(args) va_list args; { char *pat; char *s; #ifdef CHARVSPRINTF char *vsprintf(); #else int vsprintf(); #endif s = buf; #ifdef lint pat = Nullch; #else pat = va_arg(args, char *); #endif (void) vsprintf(s,pat,args); s += strlen(s); if (s[-1] != '\n') { if (line) { (void)sprintf(s," at %s line %ld", in_eval?filename:origfilename, (long)line); s += strlen(s); } if (last_in_stab && stab_io(last_in_stab) && stab_io(last_in_stab)->lines ) { (void)sprintf(s,", <%s> line %ld", last_in_stab == argvstab ? "" : last_in_stab->str_magic->str_ptr, (long)stab_io(last_in_stab)->lines); s += strlen(s); } (void)strcpy(s,".\n"); } } /*VARARGS0*/ fatal(va_alist) va_dcl { va_list args; extern FILE *e_fp; extern char *e_tmpname; #ifndef lint va_start(args); #else args = 0; #endif mess(args); va_end(args); if (in_eval) { str_set(stab_val(stabent("@",TRUE)),buf); longjmp(eval_env,1); } fputs(buf,stderr); (void)fflush(stderr); if (e_fp) (void)UNLINK(e_tmpname); statusvalue >>= 8; exit((int)(errno?errno:(statusvalue?statusvalue:255))); } /*VARARGS0*/ warn(va_alist) va_dcl { va_list args; #ifndef lint va_start(args); #else args = 0; #endif mess(args); va_end(args); fputs(buf,stderr); #ifdef LEAKTEST #ifdef DEBUGGING if (debug & 4096) xstat(); #endif #endif (void)fflush(stderr); } #endif static bool firstsetenv = TRUE; extern char **environ; void setenv(nam,val) char *nam, *val; { register int i=envix(nam); /* where does it go? */ if (!val) { while (environ[i]) { environ[i] = environ[i+1]; i++; } return; } if (!environ[i]) { /* does not exist yet */ if (firstsetenv) { /* need we copy environment? */ int j; char **tmpenv; New(901,tmpenv, i+2, char*); firstsetenv = FALSE; for (j=0; j= 0; i++) ; return i ? 0 : -1; } #endif #ifndef BCOPY #ifndef MEMCPY char * bcopy(from,to,len) register char *from; register char *to; register int len; { char *retval = to; while (len--) *to++ = *from++; return retval; } char * bzero(loc,len) register char *loc; register int len; { char *retval = loc; while (len--) *loc++ = 0; return retval; } #endif #endif #ifdef VARARGS #ifndef VPRINTF #ifdef CHARVSPRINTF char * #else int #endif vsprintf(dest, pat, args) char *dest, *pat, *args; { FILE fakebuf; fakebuf._ptr = dest; fakebuf._cnt = 32767; fakebuf._flag = _IOWRT|_IOSTRG; _doprnt(pat, args, &fakebuf); /* what a kludge */ (void)putc('\0', &fakebuf); #ifdef CHARVSPRINTF return(dest); #else return 0; /* perl doesn't use return value */ #endif } #ifdef DEBUGGING int vfprintf(fd, pat, args) FILE *fd; char *pat, *args; { _doprnt(pat, args, fd); return 0; /* wrong, but perl doesn't use the return value */ } #endif #endif /* VPRINTF */ #endif /* VARARGS */ #ifdef MYSWAP #if BYTEORDER != 04321 short my_swap(s) short s; { #if (BYTEORDER & 1) == 0 short result; result = ((s & 255) << 8) + ((s >> 8) & 255); return result; #else return s; #endif } long htonl(l) register long l; { union { long result; char c[4]; } u; #if BYTEORDER == 01234 u.c[0] = (l >> 24) & 255; u.c[1] = (l >> 16) & 255; u.c[2] = (l >> 8) & 255; u.c[3] = l & 255; return u.result; #else #if ((BYTEORDER - 01111) & 0444) || !(BYTEORDER & 7) fatal("Unknown BYTEORDER\n"); #else register int o; register int s; for (o = BYTEORDER - 01111, s = 0; s < 32; o >>= 3, s += 8) { u.c[o & 7] = (l >> s) & 255; } return u.result; #endif #endif } long ntohl(l) register long l; { union { long l; char c[4]; } u; #if BYTEORDER == 01234 u.c[0] = (l >> 24) & 255; u.c[1] = (l >> 16) & 255; u.c[2] = (l >> 8) & 255; u.c[3] = l & 255; return u.l; #else #if ((BYTEORDER - 01111) & 0444) || !(BYTEORDER & 7) fatal("Unknown BYTEORDER\n"); #else register int o; register int s; u.l = l; l = 0; for (o = BYTEORDER - 01111, s = 0; s < 32; o >>= 3, s += 8) { l |= (u.c[o & 7] & 255) << s; } return l; #endif #endif } #endif /* BYTEORDER != 04321 */ #endif /* HTONS */ FILE * mypopen(cmd,mode) char *cmd; char *mode; { int p[2]; register int this, that; register int pid; STR *str; int doexec = strNE(cmd,"-"); if (pipe(p) < 0) return Nullfp; this = (*mode == 'w'); that = !this; while ((pid = (doexec?vfork():fork())) < 0) { if (errno != EAGAIN) { close(p[this]); if (!doexec) fatal("Can't fork"); return Nullfp; } sleep(5); } if (pid == 0) { #define THIS that #define THAT this close(p[THAT]); if (p[THIS] != (*mode == 'r')) { dup2(p[THIS], *mode == 'r'); close(p[THIS]); } if (doexec) { do_exec(cmd); /* may or may not use the shell */ _exit(1); } if (tmpstab = stabent("$",allstabs)) str_numset(STAB_STR(tmpstab),(double)getpid()); return Nullfp; #undef THIS #undef THAT } close(p[that]); str = afetch(pidstatary,p[this],TRUE); str_numset(str,(double)pid); str->str_cur = 0; forkprocess = pid; return fdopen(p[this], mode); } #ifndef DUP2 dup2(oldfd,newfd) int oldfd; int newfd; { close(newfd); while (dup(oldfd) != newfd) ; /* good enough for our purposes */ } #endif int mypclose(ptr) FILE *ptr; { register int result; #ifdef VOIDSIG void (*hstat)(), (*istat)(), (*qstat)(); #else int (*hstat)(), (*istat)(), (*qstat)(); #endif int status; STR *str; register int pid; str = afetch(pidstatary,fileno(ptr),TRUE); fclose(ptr); pid = (int)str_gnum(str); if (!pid) return -1; hstat = signal(SIGHUP, SIG_IGN); istat = signal(SIGINT, SIG_IGN); qstat = signal(SIGQUIT, SIG_IGN); #ifdef WAIT4 if (wait4(pid,&status,0,Null(struct rusage *)) < 0) status = -1; #else if (pid < 0) /* already exited? */ status = str->str_cur; else { while ((result = wait(&status)) != pid && result >= 0) pidgone(result,status); if (result < 0) status = -1; } #endif signal(SIGHUP, hstat); signal(SIGINT, istat); signal(SIGQUIT, qstat); str_numset(str,0.0); return(status); } pidgone(pid,status) int pid; int status; { #ifdef WAIT4 return; #else register int count; register STR *str; for (count = pidstatary->ary_fill; count >= 0; --count) { if ((str = afetch(pidstatary,count,FALSE)) && ((int)str->str_u.str_nval) == pid) { str_numset(str, -str->str_u.str_nval); str->str_cur = status; return; } } #endif } #ifndef MEMCMP memcmp(s1,s2,len) register unsigned char *s1; register unsigned char *s2; register int len; { register int tmp; while (len--) { if (tmp = *s1++ - *s2++) return tmp; } return 0; } #endif /* MEMCMP */