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Annotation of coherent/a/usr/man/MULTI/variableargume, revision 1.1

1.1     ! root        1: 
        !             2: 
        !             3: variable arguments           Overview          variable arguments
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        !             8: The ANSI  Standard mandates the creation of a  set of routines to
        !             9: help implement  functions, such as pprriinnttff and  ssccaannff, that take a
        !            10: variable  number of  arguments.  These  routines are  called from
        !            11: within another function to help it handle its arguments.
        !            12: 
        !            13: These routines  are declared or  defined in the  header ssttddaarrgg.hh,
        !            14: and are as follows:
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        !            16: 
        !            17:      vvaa_aarrgg()  Return pointer to next argument in argument list
        !            18:      vvaa_eenndd()  Tidy up after an argument list has been traversed
        !            19:      vvaa_ssttaarrtt()Initialize object that holds function arguments
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        !            21: 
        !            22: vvaa_aarrgg and vvaa_ssttaarrtt must be implemented as macros; vvaa_eenndd must be
        !            23: implemented  as a  library function.  All  three use  the special
        !            24: type vvaa_lliisstt, which is an  object that holds the arguments to the
        !            25: function being implemented.
        !            26: 
        !            27: ***** Example *****
        !            28: 
        !            29: The following example concatenates multiple strings into a common
        !            30: allocated string and returns the string's address.
        !            31: 
        !            32: 
        !            33: #include <stdarg.h>
        !            34: #include <stdlib.h>
        !            35: #include <stddef.h>
        !            36: #include <stdio.h>
        !            37: 
        !            38: 
        !            39: 
        !            40: char *
        !            41: multcat(numargs)
        !            42: int numargs;
        !            43: {
        !            44:           va_list argptr;
        !            45:           char *result;
        !            46:           int i, siz;
        !            47: 
        !            48: 
        !            49: 
        !            50:           /* get size required */
        !            51:           va_start(argptr, numargs);
        !            52:           for(siz = i = 0; i < numargs; i++)
        !            53:           siz += strlen(va_arg(argptr, char *));
        !            54: 
        !            55: 
        !            56: 
        !            57:           if ((result = calloc(siz + 1, 1)) == NULL) {
        !            58:           fprintf(stderr, "Out of space\n");
        !            59:           exit(EXIT_FAILURE);
        !            60:           }
        !            61:           va_end(argptr);
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        !            63: 
        !            64: COHERENT Lexicon                                           Page 1
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        !            67: 
        !            68: 
        !            69: variable arguments           Overview          variable arguments
        !            70: 
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        !            75: 
        !            76:           va_start(argptr, numargs);
        !            77:           for(i = 0; i < numargs; i++)
        !            78:           strcat(result, va_arg(argptr, char *));
        !            79:           va_end(argptr);
        !            80:           return(result);
        !            81: }
        !            82: 
        !            83: 
        !            84: 
        !            85: int
        !            86: main(void)
        !            87: {
        !            88:           printf(multcat(5, "One ", "two ", "three ",
        !            89:           "testing", ".\n"));
        !            90: }
        !            91: 
        !            92: 
        !            93: ***** See Also *****
        !            94: 
        !            95: lliibbrraarriieess, ssttddaarrgg.hh
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        !           130: COHERENT Lexicon                                           Page 2
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