Audit nl(1)
1) Refactor the manpage to use the num-syntax and concise wording.
2) Build format instead of having a list of static strings.
3) BUGFIX: if (!buf[0] || buf[0] == '\n') Process last-read-line
properly.
4) BUGFIX: In case we hit a formatting line, print a newline instead
of just dropping it.
5) Use a switch instead of having spaghetti-cases.
6) Don't use printf-magic but explicitly do a putchar(' ')-loop.
7) Update usage(), indent properly.
8) BUGFIX: strchr is not NULL when type[0] is \0. Check for \0
separately beforehand.
9) Reorder arg.h-cases for better readability.
This commit is contained in:
FRIGN
parent
d49f6f2044
commit
587575dcb4
2
README
2
README
@ -49,7 +49,7 @@ The following tools are implemented ('*' == finished, '#' == UTF-8 support,
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=*| mktemp non-posix none
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=*| mv yes none (-i)
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=*| nice yes none
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#* nl yes none
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#*| nl yes none
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=*| nohup yes none
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#*| paste yes none
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=*| printenv non-posix none
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82
nl.1
82
nl.1
@ -1,4 +1,4 @@
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.Dd March 18, 2015
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.Dd March 22, 2015
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.Dt NL 1
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.Os sbase
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.Sh NAME
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@ -11,18 +11,19 @@
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.Op Fl d Ar delim
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.Op Fl f Ar type
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.Op Fl h Ar type
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.Op Fl i Ar incr
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.Op Fl i Ar num
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.Op Fl l Ar num
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.Op Fl n Ar format
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.Op Fl s Ar sep
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.Op Fl v Ar startnum
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.Op Fl w Ar width
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.Op Fl v Ar num
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.Op Fl w Ar num
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.Op Ar file
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.Sh DESCRIPTION
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.Nm
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reads lines from the named
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reads lines from
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.Ar file
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and writes them to stdout with non-empty lines numbered. If no
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and writes them to stdout, numbering non-empty lines.
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If no
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.Ar file
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is given
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.Nm
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@ -30,64 +31,61 @@ reads from stdin.
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.Sh OPTIONS
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.Bl -tag -width Ds
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.It Fl p
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Do not reset number for logical pages
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.It Fl b Ar type
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Defines which lines will be numbered for body sections:
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Do not reset line number for logical pages.
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.It Fl h Ar type | Fl b Ar type | Fl f Ar type
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Define which lines to number in the head | body | footer section:
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.Bl -tag -width pstringXX
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.It a
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All lines.
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.It n
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No lines.
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.It t
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Only non-empty lines (default).
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Only non-empty lines. This is the default.
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.It p Ns Ar expr
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Only lines which match
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.Ar expr ,
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a regular expression as defined in
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Only lines matching
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.Ar expr
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according to
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.Xr regex 7 .
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.El
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.It Fl d Ar delim
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Specify the delimiter (default is "\\:"). If only one character is specified, the second remains ':'.
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.It Fl f Ar type
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Same as
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.Fl b
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except for footer sections.
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.It Fl h Ar type
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Same as
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.Fl b
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except for header sections.
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.It Fl i Ar incr
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Defines the increment between numbered lines.
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Set
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.Ar delim
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as the delimiter for logical pages. If
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.Ar delim
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is only on character,
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.Nm
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appends ":" to it. The default is "\e:".
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.It Fl i Ar num
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Set the increment between numbered lines to
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.Ar num .
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.It Fl l Ar num
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Specify the number of adjacent blank lines to be considered as one. Default is 1.
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Set the number of adjacent blank lines to be considered as one to
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.Ar num .
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The default is 1.
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.It Fl n Ar format
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Specify the line number output format.
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The
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Set the line number output
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.Ar format
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can be any of the following:
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to one of:
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.Bl -tag -width pstringXX
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.It ln
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Left justified.
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.It rn
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Right justified.
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Right justified. This is the default.
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.It rz
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Right justified with leading zeroes.
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.El
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.Pp
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The default
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.Ar format
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is rn.
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.It Fl s Ar sep
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Defines the string used to separate line numbers and lines. By default this is
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a tab.
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.It Fl v Ar startnum
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Start counting from
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.Ar startnum
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instead of the default 1.
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.It Fl w Ar width
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The number of characters to be occupied by the line number
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will be set to
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.Ar width .
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Use
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.Ar sep
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to separate line numbers and lines. The default is "\et".
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.It Fl v Ar num
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Start counting lines from
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.Ar num .
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The default is 1.
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.It Fl w Ar num
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Set the width of the line number to
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.Ar num .
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The default is 6.
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.El
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.Sh SEE ALSO
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124
nl.c
124
nl.c
@ -9,40 +9,33 @@
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#include "utf.h"
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#include "util.h"
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/* formats here specify line number and separator (not line content) */
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#define FORMAT_LN "%-*ld%s"
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#define FORMAT_RN "%*ld%s"
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#define FORMAT_RZ "%0*ld%s"
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static char type[] = { 'n', 't', 'n' }; /* footer, body, header */
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static char *delim = "\\:";
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static const char *format = FORMAT_RN;
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static const char *sep = "\t";
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static int width = 6;
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static int pflag = 0;
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static size_t startnum = 1;
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static size_t incr = 1;
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static size_t blines = 1;
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static size_t delimlen = 2;
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static regex_t preg[3];
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static size_t startnum = 1;
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static size_t incr = 1;
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static size_t blines = 1;
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static size_t delimlen = 2;
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static int width = 6;
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static int pflag = 0;
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static char type[] = { 'n', 't', 'n' }; /* footer, body, header */
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static char *delim = "\\:";
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static char format[8] = "%*ld%s";
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static char *sep = "\t";
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static regex_t preg[3];
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static int
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getsection(char *buf, int *section)
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{
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int sectionchanged = 0;
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int newsection = *section;
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int sectionchanged = 0, newsection = *section;
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for (; !strncmp(buf, delim, delimlen); buf += delimlen) {
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if (!sectionchanged) {
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sectionchanged = 1;
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newsection = 0;
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} else {
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++newsection;
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newsection %= 3;
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newsection = (newsection + 1) % 3;
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}
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}
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if (buf && buf[0] == '\n')
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if (!buf[0] || buf[0] == '\n')
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*section = newsection;
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else
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sectionchanged = 0;
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@ -51,27 +44,33 @@ getsection(char *buf, int *section)
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}
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static void
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nl(const char *name, FILE *fp)
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nl(const char *fname, FILE *fp)
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{
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char *buf = NULL;
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size_t i, number = startnum, size = 0;
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int donumber, oldsection, section = 1, bl = 1;
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size_t number = startnum, size = 0;
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char *buf = NULL;
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while (getline(&buf, &size, fp) != -1) {
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while (getline(&buf, &size, fp) >= 0) {
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donumber = 0;
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oldsection = section;
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if (getsection(buf, §ion)) {
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if ((section >= oldsection) && !pflag)
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number = startnum;
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putchar('\n');
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continue;
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}
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if ((type[section] == 't' && buf[0] != '\n')
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|| (type[section] == 'p' &&
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!regexec(&preg[section], buf, 0, NULL, 0))) {
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donumber = 1;
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} else if (type[section] == 'a') {
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switch (type[section]) {
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case 't':
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if (buf[0] != '\n')
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donumber = 1;
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break;
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case 'p':
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if (!regexec(preg + section, buf, 0, NULL, 0))
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donumber = 1;
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break;
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case 'a':
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if (buf[0] == '\n' && bl < blines) {
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++bl;
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} else {
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@ -84,28 +83,30 @@ nl(const char *name, FILE *fp)
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printf(format, width, number, sep);
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number += incr;
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} else {
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printf("%*s", width, "");
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for (i = 0; i < width; i++)
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putchar(' ');
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}
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printf("%s", buf);
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fputs(buf, stdout);
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}
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free(buf);
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if (ferror(fp))
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eprintf("%s: read error:", name);
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eprintf("getline %s:", fname);
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}
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static void
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usage(void)
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{
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eprintf("usage: %s [-p] [-b type] [-d delim] [-f type] "
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"[-h type] [-i incr] [-l num]\n[-n format] [-s sep] "
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"[-v startnum] [-w width] [file]\n", argv0);
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eprintf("usage: %s [-p] [-b type] [-d delim] [-f type]\n"
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" [-h type] [-i num] [-l num] [-n format]\n"
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" [-s sep] [-v num] [-w num] [file]\n", argv0);
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}
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static char
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getlinetype(char *type, regex_t *preg)
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{
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if (type[0] == 'p')
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eregcomp(preg, &type[1], REG_NOSUB);
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else if (!strchr("ant", type[0]))
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eregcomp(preg, type + 1, REG_NOSUB);
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else if (!type[0] || !strchr("ant", type[0]))
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usage();
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return type[0];
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@ -115,13 +116,10 @@ int
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main(int argc, char *argv[])
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{
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FILE *fp;
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char *d;
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size_t l, s;
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char *d, *formattype, *formatblit;
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ARGBEGIN {
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case 'b':
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type[1] = getlinetype(EARGF(usage()), &preg[1]);
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break;
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case 'd':
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d = EARGF(usage());
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l = utflen(d);
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@ -131,9 +129,9 @@ main(int argc, char *argv[])
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break;
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case 1:
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s = strlen(d);
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delim = emalloc(s + 2);
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estrlcpy(delim, d, s + 2);
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estrlcat(delim, ":", s + 2);
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delim = emalloc(s + 1 + 1);
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estrlcpy(delim, d, s + 1 + 1);
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estrlcat(delim, ":", s + 1 + 1);
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delimlen = s + 1;
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break;
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default:
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@ -143,27 +141,36 @@ main(int argc, char *argv[])
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}
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break;
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case 'f':
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type[0] = getlinetype(EARGF(usage()), &preg[0]);
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type[0] = getlinetype(EARGF(usage()), preg);
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break;
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case 'b':
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type[1] = getlinetype(EARGF(usage()), preg + 1);
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break;
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case 'h':
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type[2] = getlinetype(EARGF(usage()), &preg[2]);
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type[2] = getlinetype(EARGF(usage()), preg + 2);
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break;
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case 'i':
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incr = estrtonum(EARGF(usage()), 0, MIN(LLONG_MAX, SIZE_MAX));
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break;
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case 'l':
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blines = estrtonum(EARGF(usage()), 0, UINT_MAX);
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blines = estrtonum(EARGF(usage()), 0, MIN(LLONG_MAX, SIZE_MAX));
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break;
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case 'n':
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format = EARGF(usage());
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if (!strcmp(format, "ln"))
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format = FORMAT_LN;
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else if (!strcmp(format, "rn"))
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format = FORMAT_RN;
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else if (!strcmp(format, "rz"))
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format = FORMAT_RZ;
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else
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eprintf("%s: bad format\n", format);
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formattype = EARGF(usage());
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estrlcpy(format, "%", sizeof(format));
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if (!strcmp(formattype, "ln")) {
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formatblit = "-";
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} else if (!strcmp(formattype, "rn")) {
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formatblit = "";
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} else if (!strcmp(formattype, "rz")) {
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formatblit = "0";
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} else {
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eprintf("%s: bad format\n", formattype);
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}
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estrlcat(format, formatblit, sizeof(format));
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estrlcat(format, "*ld%s", sizeof(format));
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break;
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case 'p':
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pflag = 1;
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@ -184,7 +191,7 @@ main(int argc, char *argv[])
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if (argc > 1)
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usage();
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if (argc == 0) {
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if (!argc) {
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nl("<stdin>", stdin);
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} else {
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if (!(fp = fopen(argv[0], "r")))
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@ -192,5 +199,6 @@ main(int argc, char *argv[])
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nl(argv[0], fp);
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fclose(fp);
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}
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return 0;
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}
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