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greg |
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/* Copyright (c) 1991 Regents of the University of California */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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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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#include <stdio.h> |
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#include <ctype.h> |
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char * |
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fgetword(s, n, fp) /* get a word, maximum n-1 characters */ |
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char *s; |
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int n; |
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register FILE *fp; |
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{ |
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register char *cp; |
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register int c; |
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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 end of file */ |
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if (c == EOF) |
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return(NULL); |
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/* get actual word */ |
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cp = s; |
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do { |
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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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} while (c != EOF && !isspace(c)); |
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*cp = '\0'; |
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if (c != EOF) /* replace delimiter */ |
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ungetc(c, fp); |
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return(s); |
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} |
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isint(s) /* check integer format */ |
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char *s; |
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{ |
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register char *cp = s; |
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while (isspace(*cp)) |
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cp++; |
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if (*cp == '-' || *cp == '+') |
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cp++; |
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do |
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if (!isdigit(*cp)) |
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return(0); |
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while (*++cp); |
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return(1); |
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} |
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isflt(s) /* check float format */ |
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char *s; |
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{ |
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register char *cp = s; |
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while (isspace(*cp)) |
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cp++; |
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if (*cp == '-' || *cp == '+') |
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cp++; |
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s = cp; |
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while (isdigit(*cp)) |
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cp++; |
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if (*cp == '.') { |
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cp++; s++; |
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while (isdigit(*cp)) |
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cp++; |
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} |
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if (cp == s) |
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return(0); |
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if (*cp == 'e' || *cp == 'E') |
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return(isint(cp+1)); |
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return(1); |
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} |
