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#ifndef lint |
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static const char RCSid[] = "$Id: setscan.c,v 2.2 2003/02/22 02:07:30 greg Exp $"; |
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#endif |
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/* |
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* Convert angle ranges of the form a-b:s,c to discrete values |
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*/ |
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|
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#include <ctype.h> |
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|
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#include "setscan.h" |
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|
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int |
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setscan( /* set up scan according to arg */ |
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register ANGLE *ang, |
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register char *arg |
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) |
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{ |
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int state = ','; |
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int start, finish, step; |
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|
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while (state) { |
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switch (state) { |
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case ',': |
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start = atoi(arg); |
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finish = start; |
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step = 1; |
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break; |
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case '-': |
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finish = atoi(arg); |
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if (finish < start) |
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return(-1); |
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break; |
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case ':': |
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step = atoi(arg); |
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break; |
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default: |
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return(-1); |
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} |
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if (!isdigit(*arg)) |
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return(-1); |
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do |
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arg++; |
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while (isdigit(*arg)); |
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state = *arg++; |
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if (!state || state == ',') |
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while (start <= finish) { |
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*ang++ = start; |
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start += step; |
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} |
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} |
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*ang = AEND; |
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return(0); |
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} |
