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| | 32 | .\" @(#)getsubopt.3 8.1 (Berkeley) 6/9/93 |
| | 33 | .\" $FreeBSD: src/lib/libc/stdlib/getsubopt.3,v 1.9 2001/09/07 14:46:35 asmodai Exp $ |
| | 34 | .\" |
| | 35 | .Dd June 9, 1993 |
| | 36 | .Dt GETSUBOPT 3 |
| | 37 | .Os |
| | 38 | .Sh NAME |
| | 39 | .Nm getsubopt |
| | 40 | .Nd get sub options from an argument |
| | 41 | .Sh LIBRARY |
| | 42 | .Lb libc |
| | 43 | .Sh SYNOPSIS |
| | 44 | .In unistd.h |
| | 45 | .Vt extern char *suboptarg ; |
| | 46 | .Ft int |
| | 47 | .Fn getsubopt "char **optionp" "char * const *tokens" "char **valuep" |
| | 48 | .Sh DESCRIPTION |
| | 49 | The |
| | 50 | .Fn getsubopt |
| | 51 | function |
| | 52 | parses a string containing tokens delimited by one or more tab, space or |
| | 53 | comma |
| | 54 | .Pq Ql \&, |
| | 55 | characters. |
| | 56 | It is intended for use in parsing groups of option arguments provided |
| | 57 | as part of a utility command line. |
| | 58 | .Pp |
| | 59 | The argument |
| | 60 | .Fa optionp |
| | 61 | is a pointer to a pointer to the string. |
| | 62 | The argument |
| | 63 | .Fa tokens |
| | 64 | is a pointer to a |
| | 65 | .Dv NULL Ns -terminated |
| | 66 | array of pointers to strings. |
| | 67 | .Pp |
| | 68 | The |
| | 69 | .Fn getsubopt |
| | 70 | function |
| | 71 | returns the zero-based offset of the pointer in the |
| | 72 | .Fa tokens |
| | 73 | array referencing a string which matches the first token |
| | 74 | in the string, or, \-1 if the string contains no tokens or |
| | 75 | .Fa tokens |
| | 76 | does not contain a matching string. |
| | 77 | .Pp |
| | 78 | If the token is of the form ``name=value'', the location referenced by |
| | 79 | .Fa valuep |
| | 80 | will be set to point to the start of the ``value'' portion of the token. |
| | 81 | .Pp |
| | 82 | On return from |
| | 83 | .Fn getsubopt , |
| | 84 | .Fa optionp |
| | 85 | will be set to point to the start of the next token in the string, |
| | 86 | or the null at the end of the string if no more tokens are present. |
| | 87 | The external variable |
| | 88 | .Fa suboptarg |
| | 89 | will be set to point to the start of the current token, or |
| | 90 | .Dv NULL |
| | 91 | if no |
| | 92 | tokens were present. |
| | 93 | The argument |
| | 94 | .Fa valuep |
| | 95 | will be set to point to the ``value'' portion of the token, or |
| | 96 | .Dv NULL |
| | 97 | if no ``value'' portion was present. |
| | 98 | .Sh EXAMPLES |
| | 99 | .Bd -literal -compact |
| | 100 | char *tokens[] = { |
| | 101 | #define ONE 0 |
| | 102 | "one", |
| | 103 | #define TWO 1 |
| | 104 | "two", |
| | 105 | NULL |
| | 106 | }; |
| | 107 | |
| | 108 | \&... |
| | 109 | |
| | 110 | extern char *optarg, *suboptarg; |
| | 111 | char *options, *value; |
| | 112 | |
| | 113 | while ((ch = getopt(argc, argv, "ab:")) != \-1) { |
| | 114 | switch(ch) { |
| | 115 | case 'a': |
| | 116 | /* process ``a'' option */ |
| | 117 | break; |
| | 118 | case 'b': |
| | 119 | options = optarg; |
| | 120 | while (*options) { |
| | 121 | switch(getsubopt(&options, tokens, &value)) { |
| | 122 | case ONE: |
| | 123 | /* process ``one'' sub option */ |
| | 124 | break; |
| | 125 | case TWO: |
| | 126 | /* process ``two'' sub option */ |
| | 127 | if (!value) |
| | 128 | error("no value for two"); |
| | 129 | i = atoi(value); |
| | 130 | break; |
| | 131 | case \-1: |
| | 132 | if (suboptarg) |
| | 133 | error("illegal sub option %s", |
| | 134 | suboptarg); |
| | 135 | else |
| | 136 | error("missing sub option"); |
| | 137 | break; |
| | 138 | } |
| | 139 | break; |
| | 140 | } |
| | 141 | .Ed |
| | 142 | .Sh SEE ALSO |
| | 143 | .Xr getopt 3 , |
| | 144 | .Xr strsep 3 |
| | 145 | .Sh HISTORY |
| | 146 | The |
| | 147 | .Fn getsubopt |
| | 148 | function first appeared in |
| | 149 | .Bx 4.4 . |
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