1 /*- 2 * Copyright (c) 1990, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 */ 7 8 #ifndef lint 9 static char sccsid[] = "@(#)getsubopt.c 8.1 (Berkeley) 06/04/93"; 10 #endif /* not lint */ 11 12 #include <unistd.h> 13 #include <stdlib.h> 14 15 /* 16 * The SVID interface to getsubopt provides no way of figuring out which 17 * part of the suboptions list wasn't matched. This makes error messages 18 * tricky... The extern variable suboptarg is a pointer to the token 19 * which didn't match. 20 */ 21 char *suboptarg; 22 23 getsubopt(optionp, tokens, valuep) 24 register char **optionp, **valuep; 25 register char * const *tokens; 26 { 27 register int cnt; 28 register char *p; 29 30 suboptarg = *valuep = NULL; 31 32 if (!optionp || !*optionp) 33 return(-1); 34 35 /* skip leading white-space, commas */ 36 for (p = *optionp; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p); 37 38 if (!*p) { 39 *optionp = p; 40 return(-1); 41 } 42 43 /* save the start of the token, and skip the rest of the token. */ 44 for (suboptarg = p; 45 *++p && *p != ',' && *p != '=' && *p != ' ' && *p != '\t';); 46 47 if (*p) { 48 /* 49 * If there's an equals sign, set the value pointer, and 50 * skip over the value part of the token. Terminate the 51 * token. 52 */ 53 if (*p == '=') { 54 *p = '\0'; 55 for (*valuep = ++p; 56 *p && *p != ',' && *p != ' ' && *p != '\t'; ++p); 57 if (*p) 58 *p++ = '\0'; 59 } else 60 *p++ = '\0'; 61 /* Skip any whitespace or commas after this token. */ 62 for (; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p); 63 } 64 65 /* set optionp for next round. */ 66 *optionp = p; 67 68 for (cnt = 0; *tokens; ++tokens, ++cnt) 69 if (!strcmp(suboptarg, *tokens)) 70 return(cnt); 71 return(-1); 72 } 73