1: /*	getservent.c	4.5	83/01/02	*/
   2: 
   3: #include <stdio.h>
   4: #include <sys/types.h>
   5: #include <sys/socket.h>
   6: #include <netdb.h>
   7: #include <ctype.h>
   8: # include   <sccs.h>
   9: 
  10: SCCSID(@(#)getservent.c	8.1	12/31/84)
  11: 
  12: #define MAXALIASES  35
  13: 
  14: static char SERVDB[] = "/etc/services";
  15: static FILE *servf = NULL;
  16: static char line[BUFSIZ+1];
  17: static struct servent serv;
  18: static char *serv_aliases[MAXALIASES];
  19: static int stayopen = 0;
  20: static char *any();
  21: 
  22: setservent(f)
  23:     int f;
  24: {
  25:     if (servf == NULL)
  26:         servf = fopen(SERVDB, "r" );
  27:     else
  28:         rewind(servf);
  29:     stayopen |= f;
  30: }
  31: 
  32: endservent()
  33: {
  34:     if (servf && !stayopen) {
  35:         fclose(servf);
  36:         servf = NULL;
  37:     }
  38: }
  39: 
  40: struct servent *
  41: getservent()
  42: {
  43:     char *p;
  44:     register char *cp, **q;
  45: 
  46: 
  47:     if (servf == NULL && (servf = fopen(SERVDB, "r" )) == NULL)
  48:         return (NULL);
  49: again:
  50:     if ((p = fgets(line, BUFSIZ, servf)) == NULL)
  51:         return (NULL);
  52:     if (*p == '#')
  53:         goto again;
  54:     cp = any(p, "#\n");
  55:     if (cp == NULL)
  56:         goto again;
  57:     *cp = '\0';
  58:     serv.s_name = p;
  59:     p = any(p, " \t");
  60:     if (p == NULL)
  61:         goto again;
  62:     *p++ = '\0';
  63:     while (*p == ' ' || *p == '\t')
  64:         p++;
  65:     cp = any(p, ",/");
  66:     if (cp == NULL)
  67:         goto again;
  68:     *cp++ = '\0';
  69:     serv.s_port = htons((u_short)myatoi(p));
  70:     serv.s_proto = cp;
  71:     q = serv.s_aliases = serv_aliases;
  72:     cp = any(cp, " \t");
  73:     if (cp != NULL)
  74:         *cp++ = '\0';
  75:     while (cp && *cp) {
  76:         if (*cp == ' ' || *cp == '\t') {
  77:             cp++;
  78:             continue;
  79:         }
  80:         if (q < &serv_aliases[MAXALIASES - 1])
  81:             *q++ = cp;
  82:         cp = any(cp, " \t");
  83:         if (cp != NULL)
  84:             *cp++ = '\0';
  85:     }
  86:     *q = NULL;
  87:     return (&serv);
  88: }
  89: 
  90: static char *
  91: any(cp, match)
  92:     register char *cp;
  93:     char *match;
  94: {
  95:     register char *mp, c;
  96: 
  97:     while (c = *cp) {
  98:         for (mp = match; *mp; mp++)
  99:             if (*mp == c)
 100:                 return (cp);
 101:         cp++;
 102:     }
 103:     return ((char *)0);
 104: }
 105: 
 106: static int
 107: myatoi(p)
 108: register char *p;
 109: {
 110:     register int n;
 111:     register int f;
 112: 
 113:     n = 0;
 114:     f = 0;
 115:     for(;;p++) {
 116:         switch(*p) {
 117:         case ' ':
 118:         case '\t':
 119:             continue;
 120:         case '-':
 121:             f++;
 122:         case '+':
 123:             p++;
 124:         }
 125:         break;
 126:     }
 127:     while(*p >= '0' && *p <= '9')
 128:         n = n*10 + *p++ - '0';
 129:     return(f? -n: n);
 130: }

Defined functions

any defined in line 90; used 6 times
endservent defined in line 32; used 1 times
getservent defined in line 40; used 1 times
myatoi defined in line 106; used 1 times
  • in line 69
setservent defined in line 22; used 1 times

Defined variables

SERVDB defined in line 14; used 2 times
line defined in line 16; used 1 times
  • in line 50
serv defined in line 17; used 5 times
serv_aliases defined in line 18; used 2 times
stayopen defined in line 19; used 2 times

Defined macros

MAXALIASES defined in line 12; used 2 times
Last modified: 1986-04-17
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