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65 lines
1.2 KiB
65 lines
1.2 KiB
/*
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** This file is in the public domain, so clarified as of
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** 2006-07-17 by Arthur David Olson.
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*/
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/*LINTLIBRARY*/
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#include "private.h"
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const char *
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scheck(const char *const string, const char *const format)
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{
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register char * fbuf;
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register const char * fp;
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register char * tp;
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register int c;
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register const char * result;
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char dummy;
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result = "";
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if (string == NULL || format == NULL)
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return result;
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fbuf = malloc(2 * strlen(format) + 4);
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if (fbuf == NULL)
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return result;
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fp = format;
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tp = fbuf;
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/*
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** Copy directives, suppressing each conversion that is not
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** already suppressed. Scansets containing '%' are not
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** supported; e.g., the conversion specification "%[%]" is not
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** supported. Also, multibyte characters containing a
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** non-leading '%' byte are not supported.
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*/
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while ((*tp++ = c = *fp++) != '\0') {
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if (c != '%')
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continue;
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if (is_digit(*fp)) {
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char const *f = fp;
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char *t = tp;
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do {
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*t++ = c = *f++;
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} while (is_digit(c));
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if (c == '$') {
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fp = f;
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tp = t;
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}
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}
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*tp++ = '*';
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if (*fp == '*')
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++fp;
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if ((*tp++ = *fp++) == '\0')
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break;
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}
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*(tp - 1) = '%';
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*tp++ = 'c';
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*tp = '\0';
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if (sscanf(string, fbuf, &dummy) != 1)
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result = format;
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free(fbuf);
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return result;
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}
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