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#ifndef lint |
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static const char RCSid[] = "$Id: fgetword.c,v 2.7 2017/04/09 21:33:24 greg Exp $"; |
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#endif |
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/* |
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* Read white space separated words from stream |
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* |
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* External symbols declared in rtio.h |
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*/ |
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|
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#include "copyright.h" |
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|
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#include "rtio.h" |
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|
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#include <ctype.h> |
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|
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|
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char * |
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fgetword( /* get (quoted) word up to n-1 characters */ |
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char *s, |
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int n, |
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FILE *fp |
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) |
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{ |
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int quote = '\0'; |
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char *cp; |
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int c; |
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/* sanity checks */ |
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if ((s == NULL) | (n < 2)) |
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return(NULL); |
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/* skip initial white space */ |
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do |
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c = getc(fp); |
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while (isspace(c)); |
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/* check for quote */ |
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if ((c == '"') | (c == '\'')) { |
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quote = c; |
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c = getc(fp); |
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} |
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/* get actual word */ |
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cp = s; |
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while (c != EOF && !(quote ? c==quote : isspace(c))) { |
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if (--n <= 0) /* check length limit */ |
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break; |
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*cp++ = c; |
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c = getc(fp); |
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} |
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*cp = '\0'; |
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if (c == EOF) { /* hit end-of-file? */ |
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if (cp == s) /* and got nothing? */ |
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return(NULL); |
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} else if (!quote) /* replace white character */ |
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ungetc(c, fp); |
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return(s); |
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} |
