78 lines
2.6 KiB
C
78 lines
2.6 KiB
C
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/*
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* Copyright (c) 1991 Carnegie Mellon University
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* All Rights Reserved.
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*
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* Permission to use, copy, modify and distribute this software and its
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* documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
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* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the rights
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* to redistribute these changes.
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*/
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/*
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* nxtarg -- strip off arguments from a string
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*
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* Usage: p = nxtarg (&q,brk);
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* char *p,*q,*brk;
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* extern char _argbreak;
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*
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* q is pointer to next argument in string
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* after call, p points to string containing argument,
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* q points to remainder of string
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*
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* Leading blanks and tabs are skipped; the argument ends at the
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* first occurence of one of the characters in the string "brk".
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* When such a character is found, it is put into the external
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* variable "_argbreak", and replaced by a null character; if the
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* arg string ends before that, then the null character is
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* placed into _argbreak;
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* If "brk" is 0, then " " is substituted.
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*
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* HISTORY
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* 01-Jul-83 Steven Shafer (sas) at Carnegie-Mellon University
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* Bug fix: added check for "back >= front" in loop to chop trailing
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* white space.
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*
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* 20-Nov-79 Steven Shafer (sas) at Carnegie-Mellon University
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* Rewritten for VAX. By popular demand, a table of break characters
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* has been added (implemented as a string passed into nxtarg).
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*
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* Originally from klg (Ken Greer); IUS/SUS UNIX.
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*/
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char _argbreak;
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char *skipto();
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char *nxtarg (q,brk)
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char **q,*brk;
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{
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register char *front,*back;
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front = *q; /* start of string */
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/* leading blanks and tabs */
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while (*front && (*front == ' ' || *front == '\t')) front++;
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/* find break character at end */
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if (brk == 0) brk = " ";
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back = skipto (front,brk);
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_argbreak = *back;
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*q = (*back ? back+1 : back); /* next arg start loc */
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/* elim trailing blanks and tabs */
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back -= 1;
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while ((back >= front) && (*back == ' ' || *back == '\t')) back--;
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back++;
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if (*back) *back = '\0';
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return (front);
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}
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