commit ec6924a56e5522a90788c49f060bd53c6379e1b2
parent c68bba6867a1898bea65f8fb411ed328c226adca
Author: Connor Lane Smith <cls@lubutu.com>
Date: Sat, 9 Jun 2012 18:53:05 +0100
seq: set ff=unix (?!)
Diffstat:
| M | seq.c | | | 316 | ++++++++++++++++++++++++++++++++++++++++---------------------------------------- |
1 file changed, 158 insertions(+), 158 deletions(-)
diff --git a/seq.c b/seq.c
@@ -1,158 +1,158 @@
-/* See LICENSE file for copyright and license details. */
-#include <stdbool.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-#include "util.h"
-
-static int digitsleft(const char *);
-static int digitsright(const char *);
-static double estrtod(const char *);
-static bool validfmt(const char *);
-
-int
-main(int argc, char *argv[])
-{
- const char *starts = "1", *steps = "1", *ends = "1", *sep = "\n";
- bool fflag = false, wflag = false;
- char c, ftmp[BUFSIZ], *fmt = ftmp;
- double start, step, end, out, dir;
-
- while((c = getopt(argc, argv, "f:s:w")) != -1)
- switch(c) {
- case 'f':
- if(!validfmt(optarg))
- eprintf("%s: invalid format\n", optarg);
- fmt = optarg;
- fflag = true;
- break;
- case 's':
- sep = optarg;
- break;
- case 'w':
- wflag = true;
- break;
- }
-
- switch(argc-optind) {
- case 3:
- starts = argv[optind++];
- steps = argv[optind++];
- ends = argv[optind++];
- break;
- case 2:
- starts = argv[optind++];
- /* fallthrough */
- case 1:
- ends = argv[optind++];
- break;
- default:
- eprintf("usage: %s [-w] [-f fmt] [-s separator] [start [step]] end\n", argv[0]);
- }
- start = estrtod(starts);
- step = estrtod(steps);
- end = estrtod(ends);
-
- dir = (step > 0) ? 1.0 : -1.0;
- if(step == 0 || start * dir > end * dir)
- return EXIT_FAILURE;
-
- if(fmt == ftmp) {
- int right = MAX(digitsright(starts),
- MAX(digitsright(ends),
- digitsright(steps)));
-
- if(wflag) {
- int left = MAX(digitsleft(starts), digitsleft(ends));
-
- snprintf(ftmp, sizeof ftmp, "%%0%d.%df", right+left+(right != 0), right);
- }
- else
- snprintf(ftmp, sizeof ftmp, "%%.%df", right);
- }
- for(out = start; out * dir <= end * dir; out += step) {
- if(out != start)
- fputs(sep, stdout);
- printf(fmt, out);
- }
- printf("\n");
-
- return EXIT_SUCCESS;
-}
-
-int
-digitsleft(const char *d)
-{
- char *exp;
- int shift;
-
- if(*d == '+')
- d++;
- exp = strpbrk(d, "eE");
- shift = exp ? atoi(&exp[1]) : 0;
-
- return MAX(0, strspn(d, "-0123456789")+shift);
-}
-
-int
-digitsright(const char *d)
-{
- char *exp;
- int shift, after;
-
- exp = strpbrk(d, "eE");
- shift = exp ? atoi(&exp[1]) : 0;
- after = (d = strchr(d, '.')) ? strspn(&d[1], "0123456789") : 0;
-
- return MAX(0, after-shift);
-}
-
-double
-estrtod(const char *s)
-{
- char *end;
- double d;
-
- d = strtod(s, &end);
- if(end == s || *end != '\0')
- eprintf("%s: not a real number\n", s);
- return d;
-}
-
-bool
-validfmt(const char *fmt)
-{
- int occur = 0;
-
-literal:
- while(*fmt)
- if(*fmt++ == '%')
- goto format;
- return occur == 1;
-
-format:
- if(*fmt == '%') {
- fmt++;
- goto literal;
- }
- fmt += strspn(fmt, "-+#0 '");
- fmt += strspn(fmt, "0123456789");
- if(*fmt == '.') {
- fmt++;
- fmt += strspn(fmt, "0123456789");
- }
- if(*fmt == 'L')
- fmt++;
-
- switch(*fmt) {
- case 'f': case 'F':
- case 'g': case 'G':
- case 'e': case 'E':
- case 'a': case 'A':
- occur++;
- goto literal;
- default:
- return false;
- }
-}
+/* See LICENSE file for copyright and license details. */
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include "util.h"
+
+static int digitsleft(const char *);
+static int digitsright(const char *);
+static double estrtod(const char *);
+static bool validfmt(const char *);
+
+int
+main(int argc, char *argv[])
+{
+ const char *starts = "1", *steps = "1", *ends = "1", *sep = "\n";
+ bool fflag = false, wflag = false;
+ char c, ftmp[BUFSIZ], *fmt = ftmp;
+ double start, step, end, out, dir;
+
+ while((c = getopt(argc, argv, "f:s:w")) != -1)
+ switch(c) {
+ case 'f':
+ if(!validfmt(optarg))
+ eprintf("%s: invalid format\n", optarg);
+ fmt = optarg;
+ fflag = true;
+ break;
+ case 's':
+ sep = optarg;
+ break;
+ case 'w':
+ wflag = true;
+ break;
+ }
+
+ switch(argc-optind) {
+ case 3:
+ starts = argv[optind++];
+ steps = argv[optind++];
+ ends = argv[optind++];
+ break;
+ case 2:
+ starts = argv[optind++];
+ /* fallthrough */
+ case 1:
+ ends = argv[optind++];
+ break;
+ default:
+ eprintf("usage: %s [-w] [-f fmt] [-s separator] [start [step]] end\n", argv[0]);
+ }
+ start = estrtod(starts);
+ step = estrtod(steps);
+ end = estrtod(ends);
+
+ dir = (step > 0) ? 1.0 : -1.0;
+ if(step == 0 || start * dir > end * dir)
+ return EXIT_FAILURE;
+
+ if(fmt == ftmp) {
+ int right = MAX(digitsright(starts),
+ MAX(digitsright(ends),
+ digitsright(steps)));
+
+ if(wflag) {
+ int left = MAX(digitsleft(starts), digitsleft(ends));
+
+ snprintf(ftmp, sizeof ftmp, "%%0%d.%df", right+left+(right != 0), right);
+ }
+ else
+ snprintf(ftmp, sizeof ftmp, "%%.%df", right);
+ }
+ for(out = start; out * dir <= end * dir; out += step) {
+ if(out != start)
+ fputs(sep, stdout);
+ printf(fmt, out);
+ }
+ printf("\n");
+
+ return EXIT_SUCCESS;
+}
+
+int
+digitsleft(const char *d)
+{
+ char *exp;
+ int shift;
+
+ if(*d == '+')
+ d++;
+ exp = strpbrk(d, "eE");
+ shift = exp ? atoi(&exp[1]) : 0;
+
+ return MAX(0, strspn(d, "-0123456789")+shift);
+}
+
+int
+digitsright(const char *d)
+{
+ char *exp;
+ int shift, after;
+
+ exp = strpbrk(d, "eE");
+ shift = exp ? atoi(&exp[1]) : 0;
+ after = (d = strchr(d, '.')) ? strspn(&d[1], "0123456789") : 0;
+
+ return MAX(0, after-shift);
+}
+
+double
+estrtod(const char *s)
+{
+ char *end;
+ double d;
+
+ d = strtod(s, &end);
+ if(end == s || *end != '\0')
+ eprintf("%s: not a real number\n", s);
+ return d;
+}
+
+bool
+validfmt(const char *fmt)
+{
+ int occur = 0;
+
+literal:
+ while(*fmt)
+ if(*fmt++ == '%')
+ goto format;
+ return occur == 1;
+
+format:
+ if(*fmt == '%') {
+ fmt++;
+ goto literal;
+ }
+ fmt += strspn(fmt, "-+#0 '");
+ fmt += strspn(fmt, "0123456789");
+ if(*fmt == '.') {
+ fmt++;
+ fmt += strspn(fmt, "0123456789");
+ }
+ if(*fmt == 'L')
+ fmt++;
+
+ switch(*fmt) {
+ case 'f': case 'F':
+ case 'g': case 'G':
+ case 'e': case 'E':
+ case 'a': case 'A':
+ occur++;
+ goto literal;
+ default:
+ return false;
+ }
+}
