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annotate libnumutil/numstring.c @ 15:a24f0794ab4d default tip

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INSTALL: document the new way
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 21 May 2024 00:29:21 +0000
parents 159dd90eeafe
children
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1 /*
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2 * Utility functions for number string initial parsing or preening.
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3 * grok_number_string() checks whether or not a user-supplied string
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4 * argument is fully numeric (with possibility of allowing hyphens),
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5 * and returns the number of digits. dehyphen_number_string() copies
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6 * a possibly-hyphenated number string to a new buffer with all hyphens
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7 * taken out.
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8 */
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9
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10 #include <ctype.h>
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11
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12 #include <themwi/nanp/number_utils.h>
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13
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14 int grok_number_string(const char *str, bool allow_hyphen)
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15 {
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16 const char *cp;
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17 int c, n;
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18 bool last_hyphen;
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19
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20 n = 0;
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21 last_hyphen = false;
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22 for (cp = str; *cp; ) {
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23 c = *cp++;
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24 if (isdigit(c)) {
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25 n++;
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26 last_hyphen = false;
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27 } else if (c == '-') {
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28 if (!allow_hyphen || !n || last_hyphen)
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29 return(-1);
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30 last_hyphen = true;
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31 } else
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32 return(-1);
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33 }
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34 if (last_hyphen)
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35 return(-1);
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36 return n;
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37 }
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38
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39 void dehyphen_number_string(const char *src, char *dest)
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40 {
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41 const char *cp;
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42 char *dp;
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43 int c;
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44
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45 dp = dest;
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46 for (cp = src; *cp; ) {
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47 c = *cp++;
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48 if (isdigit(c))
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49 *dp++ = c;
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50 }
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51 *dp = '\0';
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52 }