sbase

suckless unix tools
git clone git://git.2f30.org/sbase.git
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commit e8d6e30106ac0a2d97d5cdfe640e19277bb36648
parent ff96728bdd586d89fa19f605446e9b1b56b35f0e
Author: Christoph Lohmann <20h@r-36.net>
Date:   Tue Apr 10 17:33:19 +0200

Adding seq command.
Diffstat:
LICENSE | 2++
Makefile | 1+
seq.c | 167+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 170 insertions(+), 0 deletions(-)
diff --git a/LICENSE b/LICENSE @@ -8,6 +8,8 @@ MIT/X Consortium License © 2011 pancake <pancake@youterm.com> © 2011 Random832 <random832@fastmail.us> © 2012 William Haddon <william@haddonthethird.net> +© 2012 Kurt H. Maier <khm@intma.in> +© 2012 Christoph Lohmann <20h@r-36.net> Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), diff --git a/Makefile b/Makefile @@ -51,6 +51,7 @@ SRC = \ true.c \ tty.c \ uname.c \ + seq.c \ wc.c OBJ = $(SRC:.c=.o) $(LIB) diff --git a/seq.c b/seq.c @@ -0,0 +1,167 @@ +/* See LICENSE file for copyright and license details. */ +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> +#include <stdbool.h> +#include <libgen.h> + +#include "util.h" + +char afmt[4096]; + +char * +getalignedwidthfmt(char *fmt, char *starts, char *steps, char *ends) +{ + char starttmp[4096], steptmp[4096], endtmp[4096]; + char *startdelim, *stepdelim, *enddelim; + int startl, startr, stepr, endl, endr; + int maxl, maxr; + + /* + * 1.) Get a temp buffer we can work in. + * 2.) Calculate the *r(ight) and *l(eft) size. + */ + memmove(starttmp, starts, strlen(starts)+1); + startdelim = strchr(starttmp, '.'); + if (startdelim != NULL) { + startdelim[0] = '\0'; + startr = strlen(startdelim+1); + } else { + startr = 0; + } + startl = strlen(starttmp); + if (starttmp[0] == '+') + startl--; + + memmove(endtmp, ends, strlen(ends)+1); + enddelim = strchr(endtmp, '.'); + if (enddelim != NULL) { + enddelim[0] = '\0'; + endr = strlen(enddelim+1); + } else { + endr = 0; + } + endl = strlen(endtmp); + if (endtmp[0] == '+') + endl--; + + /* + * We do not care for the left length of the step, because it + * will never be displayed. + */ + memmove(steptmp, steps, strlen(steps)+1); + stepdelim = strchr(steptmp, '.'); + if (stepdelim != NULL) { + stepdelim[0] = '\0'; + stepr = strlen(stepdelim+1); + } else { + stepr = 0; + } + + maxl = (startl > endl)? startl : endl; + maxr = (startl > endr)? startr : endr; + if (stepr > maxr) + maxr = stepr; + + if (maxl <= 1) { + snprintf(afmt, sizeof(afmt), "%%.%df", maxr); + } else if (maxr == 0) { + snprintf(afmt, sizeof(afmt), "%%0%d.f", maxl); + } else { + snprintf(afmt, sizeof(afmt), "%%0%d.%df", maxl+maxr+1, maxr); + } + + return afmt; +} + +int +main(int argc, char *argv[]) +{ + char c, *fmt, *sep, *starts, *steps, *ends; + bool wflag = false; + double start, step, end, out; + + sep = "\n"; + fmt = "%G"; + + starts = "1"; + steps = "1"; + ends = "1"; + + while((c = getopt(argc, argv, "f:s:w")) != -1) { + switch(c) { + case 'f': + fmt = optarg; + 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++]; + ends = argv[optind++]; + break; + case 1: + ends = argv[optind++]; + break; + default: + eprintf("usage: %s [-f fmt] [-s separator] [-w] [start [step]]" + " end\n", basename(argv[0])); + } + + start = atof(starts); + step = atof(steps); + end = atof(ends); + + if (step == 0) + return EXIT_FAILURE; + + if (start > end) { + if (step > 0) + return EXIT_FAILURE; + } else if (start < end) { + if (step < 0) + return EXIT_FAILURE; + } + + if (wflag) + fmt = getalignedwidthfmt(fmt, starts, steps, ends); + printf("%s\n", fmt); + + for (out = start;;) { + printf(fmt, out); + + out += step; + if (start > end) { + if (out >= end) { + printf("%s", sep); + } else { + break; + } + } else if (start < end) { + if (out <= end) { + printf("%s", sep); + } else { + break; + } + } else { + break; + } + } + printf("\n"); + + return EXIT_SUCCESS; +} +