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126 lines
3.1 KiB
C
126 lines
3.1 KiB
C
/*
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* vfprintf() and vprintf() clones. They will produce unexpected results
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* when excessive dynamic ("*") field widths are specified. To be used for
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* testing purposes only.
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*
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* Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
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*/
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#ifndef lint
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static char sccsid[] = "@(#) vfprintf.c 1.2 94/03/23 17:44:46";
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#endif
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#include <stdio.h>
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#include <ctype.h>
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#ifdef __STDC__
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#include <stdarg.h>
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#else
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#include <varargs.h>
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#endif
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/* vfprintf - print variable-length argument list to stream */
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int vfprintf(fp, format, ap)
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FILE *fp;
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char *format;
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va_list ap;
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{
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char fmt[BUFSIZ]; /* format specifier */
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register char *fmtp;
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register char *cp;
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int count = 0;
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/*
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* Iterate over characters in the format string, picking up arguments
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* when format specifiers are found.
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*/
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for (cp = format; *cp; cp++) {
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if (*cp != '%') {
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putc(*cp, fp); /* ordinary character */
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count++;
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} else {
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/*
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* Format specifiers are handled one at a time, since we can only
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* deal with arguments one at a time. Try to determine the end of
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* the format specifier. We do not attempt to fully parse format
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* strings, since we are ging to let fprintf() do the hard work.
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* In regular expression notation, we recognize:
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*
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* %-?0?([0-9]+|\*)?\.?([0-9]+|\*)?l?[a-z]
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*
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* which includes some combinations that do not make sense.
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*/
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fmtp = fmt;
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*fmtp++ = *cp++;
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if (*cp == '-') /* left-adjusted field? */
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*fmtp++ = *cp++;
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if (*cp == '0') /* zero-padded field? */
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*fmtp++ = *cp++;
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if (*cp == '*') { /* dynamic field witdh */
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sprintf(fmtp, "%d", va_arg(ap, int));
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fmtp += strlen(fmtp);
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cp++;
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} else {
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while (isdigit(*cp)) /* hard-coded field width */
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*fmtp++ = *cp++;
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}
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if (*cp == '.') /* width/precision separator */
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*fmtp++ = *cp++;
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if (*cp == '*') { /* dynamic precision */
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sprintf(fmtp, "%d", va_arg(ap, int));
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fmtp += strlen(fmtp);
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cp++;
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} else {
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while (isdigit(*cp)) /* hard-coded precision */
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*fmtp++ = *cp++;
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}
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if (*cp == 'l') /* long whatever */
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*fmtp++ = *cp++;
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if (*cp == 0) /* premature end, punt */
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break;
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*fmtp++ = *cp; /* type (checked below) */
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*fmtp = 0;
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/* Execute the format string - let fprintf() do the hard work. */
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switch (fmtp[-1]) {
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case 's': /* string-valued argument */
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count += fprintf(fp, fmt, va_arg(ap, char *));
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break;
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case 'c': /* integral-valued argument */
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case 'd':
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case 'u':
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case 'o':
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case 'x':
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if (fmtp[-2] == 'l')
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count += fprintf(fp, fmt, va_arg(ap, long));
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else
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count += fprintf(fp, fmt, va_arg(ap, int));
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break;
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case 'e': /* float-valued argument */
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case 'f':
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case 'g':
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count += fprintf(fp, fmt, va_arg(ap, double));
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break;
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default: /* anything else */
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putc(fmtp[-1], fp);
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count++;
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break;
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}
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}
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}
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return (count);
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}
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/* vprintf - print variable-length argument list to stdout */
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vprintf(format, ap)
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char *format;
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va_list ap;
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{
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return (vfprintf(stdout, format, ap));
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}
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