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-rw-r--r--toys/posix/nl.c94
1 files changed, 94 insertions, 0 deletions
diff --git a/toys/posix/nl.c b/toys/posix/nl.c
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+/* nl.c - print line numbers
+ *
+ * Copyright 2013 CE Strake <strake888@gmail.com>
+ *
+ * See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/nl.html
+ *
+ * This implements a subset: only one logical page (-ip), no sections (-dfh).
+ * todo: -lv
+
+USE_NL(NEWTOY(nl, "v#<1=1l#b:n:s:w#<0=6E", TOYFLAG_BIN))
+
+config NL
+ bool "nl"
+ default y
+ help
+ usage: nl [-E] [-l #] [-b MODE] [-n STYLE] [-s SEPARATOR] [-w WIDTH] [FILE...]
+
+ Number lines of input.
+
+ -E Use extended regex syntax (when doing -b pREGEX)
+ -b which lines to number: a (all) t (non-empty, default) pREGEX (pattern)
+ -l Only count last of this many consecutive blank lines
+ -n number STYLE: ln (left justified) rn (right justified) rz (zero pad)
+ -s Separator to use between number and line (instead of TAB)
+ -w Width of line numbers (default 6)
+*/
+
+#define FOR_nl
+#include "toys.h"
+#include "lib/xregcomp.h"
+
+GLOBALS(
+ long w;
+ char *s;
+ char *n;
+ char *b;
+ long l;
+ long v;
+
+ // Count of consecutive blank lines for -l has to persist between files
+ long lcount;
+)
+
+void do_nl(int fd, char *name)
+{
+ FILE *f = xfdopen(fd, "r");
+ int w = TT.w, slen = strlen(TT.s);
+
+ for (;;) {
+ char *line = 0;
+ size_t temp;
+ int match = *TT.b != 'n';
+
+ if (getline(&line, &temp, f) < 1) {
+ if (ferror(f)) perror_msg("%s", name);
+ break;
+ }
+
+ if (*TT.b == 'p') match = !regexec((void *)(toybuf+16), line, 0, 0, 0);
+ if (TT.l || *TT.b == 't')
+ if (*line == '\n') match = TT.l && ++TT.lcount >= TT.l;
+ if (match) {
+ TT.lcount = 0;
+ printf(toybuf, w, TT.v++, TT.s);
+ } else printf("%*c", (int)w+slen, ' ');
+ xprintf("%s", line);
+
+ free(line);
+ }
+
+ fclose(f);
+}
+
+void nl_main(void)
+{
+ char *clip = "";
+
+ if (!TT.s) TT.s = "\t";
+
+ if (!TT.n || !strcmp(TT.n, "rn")); // default
+ else if (!strcmp(TT.n, "ln")) clip = "-";
+ else if (!strcmp(TT.n, "rz")) clip = "0";
+ else error_exit("bad -n '%s'", TT.n);
+
+ sprintf(toybuf, "%%%s%s", clip, "*ld%s");
+
+ if (!TT.b) TT.b = "t";
+ if (*TT.b == 'p' && TT.b[1])
+ xregcomp((void *)(toybuf+16), TT.b+1,
+ REG_NOSUB | (toys.optflags&FLAG_E)*REG_EXTENDED);
+ else if (!strchr("atn", *TT.b)) error_exit("bad -b '%s'", TT.b);
+
+ loopfiles (toys.optargs, do_nl);
+}