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#ifndef lint |
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static const char RCSid[] = "$Id: fgetword.c,v 2.8 2017/08/10 19:10:44 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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#define isquote(c) (((c) == '"') | ((c) == '\'')) |
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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 (isquote(c)) { |
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quote = c; |
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c = getc(fp); |
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} |
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cp = s; /* get actual word */ |
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while (c != EOF) { |
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if (c == quote) /* end quote? */ |
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quote = '\0'; |
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else if (!quote && isquote(c)) |
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quote = c; /* started new quote */ |
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else { |
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if (!quote && isspace(c)) |
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break; /* end of word */ |
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if (--n <= 0) |
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break; /* hit length limit */ |
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*cp++ = c; |
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} |
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c = getc(fp); /* get next character */ |
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} |
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*cp = '\0'; |
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if ((c == EOF) & (cp == s)) /* hit end-of-file? */ |
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return(NULL); |
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return(s); |
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} |
