- printf shouldn't bail out if a conversion fails, it should just keep
processing them. - \c escape to immediately stop output (similar to echo's \c) - \0NNN should be allowed for octal character escapes (instead of just \NNN) - %b conversion, which is like %s but interprets \n \t etc. inside the string is missing. And I may not be any poet, but in lieu of an in-tree regression test: ref5% ./printf '%s%b%b%c%s%d\n' 'PR' '\0072' '\t' '3' '56' 0x10 PR: 35616 Submitted by: tjr MFC after: 1 week
This commit is contained in:
Juli Mallett
parent
055c131503
commit
ab5a295bdc
@ -62,7 +62,8 @@ The
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.Ar arguments
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after the first are treated as strings if the corresponding format is
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either
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.Cm c
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.Cm c ,
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.Cm b
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or
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.Cm s ;
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otherwise it is evaluated as a C constant, with the following extensions:
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@ -71,8 +72,8 @@ otherwise it is evaluated as a C constant, with the following extensions:
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.It
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A leading plus or minus sign is allowed.
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.It
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If the leading character is a single or double quote, or not a digit,
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plus, or minus sign, the value is the ASCII code of the next character.
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If the leading character is a single or double quote the value is the ASCII
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code of the next character.
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.El
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.Pp
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The format string is reused as often as necessary to satisfy the
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@ -81,7 +82,8 @@ Any extra format specifications are evaluated with zero or the null
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string.
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.Pp
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Character escape sequences are in backslash notation as defined in the
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.St -ansiC .
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.St -ansiC ,
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with extensions.
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The characters and their meanings
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are as follows:
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.Pp
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@ -90,6 +92,8 @@ are as follows:
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Write a <bell> character.
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.It Cm \eb
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Write a <backspace> character.
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.It Cm \ec
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Ignore remaining characters in this string.
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.It Cm \ef
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Write a <form-feed> character.
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.It Cm \en
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@ -105,6 +109,7 @@ Write a <single quote> character.
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.It Cm \e\e
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Write a backslash character.
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.It Cm \e Ns Ar num
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.It Cm \e0 Ns Ar num
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Write an 8-bit character whose
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.Tn ASCII
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value is the 1-, 2-, or 3-digit
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@ -187,7 +192,7 @@ from a string; if the digit string is missing, the precision is treated
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as zero;
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.It Format:
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A character which indicates the type of format to use (one of
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.Cm diouxXfwEgGcs ) .
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.Cm diouxXfwEgGcsb ) .
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.El
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.Pp
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A field width or precision may be
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@ -244,6 +249,11 @@ Characters from the string
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are printed until the end is reached or until the number of characters
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indicated by the precision specification is reached; however if the
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precision is 0 or missing, all characters in the string are printed.
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.It Cm b
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As for
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.Cm s ,
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but interpret character escapes in backslash notation in the string
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.Ar argument .
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.It Cm \&%
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Print a `%'; no argument is used.
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.El
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@ -257,8 +267,20 @@ a field; padding takes place only if the specified field width exceeds
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the actual width.
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.Sh DIAGNOSTICS
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.Ex -std
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.Sh COMPATIBILITY
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The traditional
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.Bx
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behavior of converting arguments of numeric formats not beginning
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with a digit to the ASCII code of the first characer is not supported.
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.Sh SEE ALSO
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.Xr echo 1 ,
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.Xr printf 3
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.Sh STANDARDS
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The
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.Nm
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command is expected to be compatible with the
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.St -p1003.2
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specification.
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.Sh HISTORY
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The
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.Nm
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@ -89,7 +89,7 @@ static const char rcsid[] =
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}
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static int asciicode(void);
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static void escape(char *);
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static int escape(char *);
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static int getchr(void);
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static double getdouble(void);
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static int getint(int *);
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@ -110,7 +110,7 @@ main(argc, argv)
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char *argv[];
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{
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static const char *skip1, *skip2;
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int ch, end, fieldwidth, precision;
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int ch, chopped, end, fieldwidth, precision;
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char convch, nextch, *format, *fmt, *start;
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#ifndef BUILTIN
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@ -142,7 +142,7 @@ main(argc, argv)
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skip1 = "#-+ 0";
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skip2 = "0123456789";
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escape(fmt = format = *argv); /* backslash interpretation */
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chopped = escape(fmt = format = *argv); /* backslash interpretation */
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gargv = ++argv;
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for (;;) {
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end = 0;
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@ -150,6 +150,10 @@ main(argc, argv)
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next: for (start = fmt;; ++fmt) {
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if (!*fmt) {
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/* avoid infinite loop */
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if (chopped) {
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(void)printf("%s", start);
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return (0);
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}
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if (end == 1) {
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warnx1("missing format character",
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NULL, NULL);
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@ -209,6 +213,21 @@ next: for (start = fmt;; ++fmt) {
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nextch = *++fmt;
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*fmt = '\0';
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switch(convch) {
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case 'b': {
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char *p;
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int getout;
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if ((p = strdup(getstr())) == NULL)
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err(1, NULL);
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getout = escape(p);
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*(fmt - 1) = 's';
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PF(start, p)
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*(fmt - 1) = 'b';
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free(p);
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if (getout)
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return (0);
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break;
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}
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case 'c': {
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char p;
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@ -227,11 +246,10 @@ next: for (start = fmt;; ++fmt) {
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quad_t p;
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char *f;
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if ((f = mklong(start, convch)) == NULL)
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return (1);
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if (getquad(&p))
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return (1);
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PF(f, p);
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if ((f = mklong(start, convch)) != NULL &&
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!getquad(&p)) {
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PF(f, p);
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}
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break;
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}
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case 'e': case 'E': case 'f': case 'g': case 'G': {
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@ -280,7 +298,7 @@ mklong(str, ch)
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return (copy);
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}
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static void
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static int
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escape(fmt)
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register char *fmt;
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{
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@ -296,7 +314,7 @@ escape(fmt)
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case '\0': /* EOS, user error */
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*store = '\\';
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*++store = '\0';
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return;
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return (0);
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case '\\': /* backslash */
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case '\'': /* single quote */
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*store = *fmt;
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@ -307,6 +325,9 @@ escape(fmt)
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case 'b': /* backspace */
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*store = '\b';
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break;
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case 'c':
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*store = '\0';
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return (1);
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case 'f': /* form-feed */
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*store = '\f';
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break;
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@ -325,7 +346,7 @@ escape(fmt)
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/* octal constant */
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case '0': case '1': case '2': case '3':
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case '4': case '5': case '6': case '7':
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for (c = 3, value = 0;
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for (c = *fmt == '0' ? 4 : 3, value = 0;
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c-- && *fmt >= '0' && *fmt <= '7'; ++fmt) {
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value <<= 3;
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value += *fmt - '0';
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@ -339,6 +360,7 @@ escape(fmt)
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}
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}
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*store = '\0';
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return (0);
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}
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static int
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@ -357,7 +379,6 @@ getstr()
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return (*gargv++);
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}
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static const char *Number = "+-.0123456789";
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static int
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getint(ip)
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int *ip;
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@ -366,10 +387,8 @@ getint(ip)
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if (getquad(&val))
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return (1);
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if (val < INT_MIN || val > INT_MAX) {
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if (val < INT_MIN || val > INT_MAX)
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warnx3("%s: %s", *gargv, strerror(ERANGE));
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return (1);
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}
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*ip = (int)val;
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return (0);
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}
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@ -385,39 +404,49 @@ getquad(lp)
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*lp = 0;
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return (0);
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}
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if (strchr(Number, **gargv)) {
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errno = 0;
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val = strtoq(*gargv, &ep, 0);
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if (*ep != '\0') {
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warnx2("%s: illegal number", *gargv, NULL);
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return (1);
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}
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if (errno == ERANGE)
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if (val == QUAD_MAX) {
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warnx3("%s: %s", *gargv, strerror(ERANGE));
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return (1);
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}
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if (val == QUAD_MIN) {
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warnx3("%s: %s", *gargv, strerror(ERANGE));
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return (1);
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}
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*lp = val;
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++gargv;
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if (**gargv == '"' || **gargv == '\'') {
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*lp = (quad_t)asciicode();
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return (0);
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}
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*lp = (long)asciicode();
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errno = 0;
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val = strtoq(*gargv, &ep, 0);
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if (ep == *gargv)
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warnx2("%s: expected numeric value", *gargv, NULL);
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else if (*ep != '\0')
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warnx2("%s: not completely converted", *gargv, NULL);
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if (errno == ERANGE)
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warnx3("%s: %s", *gargv, strerror(ERANGE));
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*lp = val;
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++gargv;
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return (0);
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}
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static double
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getdouble()
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{
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double val;
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char *ep;
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if (!*gargv)
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return ((double)0);
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if (strchr(Number, **gargv))
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return (atof(*gargv++));
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return ((double)asciicode());
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if (**gargv == '"' || **gargv == '\'') {
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val = (double)asciicode();
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return (val);
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}
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errno = 0;
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val = strtod(*gargv, &ep);
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if (ep == *gargv)
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warnx2("%s: expected numeric value", *gargv, NULL);
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else if (*ep != '\0')
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warnx2("%s: not completely converted", *gargv, NULL);
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if (errno == ERANGE)
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warnx3("%s: %s", *gargv, strerror(ERANGE));
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++gargv;
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return (val);
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}
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static int
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