1 #define numeric(c) (c>='0' && c<='9')
2 #define max(a,b) (a<b ? b : a)
3 #define min(a,b) (a>b ? b : a)
4 #define abs(x) (x<0 ? -x : x)
5 
6 #define copy(src,dest) strcpy(dest,src)
7 #define compare(str1,str2) strcmp(str1,str2)
8 #define equal(str1,str2) !strcmp(str1,str2)
9 #define length(str) strlen(str)
10 #define size(str) (1+strlen(str))
11 
12 #include "sys/types.h"
13 #include "sys/stat.h"
14 struct stat Statbuf;
15 #define exists(file) (stat(file,&Statbuf)<0 ? 0:Statbuf.st_mode)
16 
17 #define xfopen(file,mode) fdopen(xopen(file,mode),mode==0?"r":mode==1?"w":"r+w")
18 #define xfcreat(file,mode) fdopen(xcreat(file,mode),"w")
19 #define remove(file) xunlink(file)
20 
21 #define SCCSID(arg) static char Sccsid[] = "arg"
22 
23 #define USXALLOC()
24 
25 #define NONBLANK(p) while (*p==' ' || *p=='\t') p++
26 
27 char Null[1];
28 char Error[128];
29