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https://github.com/jart/cosmopolitan.git
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2bfd6b37c1
* start on improving __paginate * make __paginate more robust * add __paginate_file * cleanup __paginate unlinking
109 lines
4.1 KiB
C
109 lines
4.1 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2022 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/calls.h"
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#include "libc/calls/syscall_support-nt.internal.h"
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#include "libc/dce.h"
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#include "libc/intrin/safemacros.internal.h"
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#include "libc/limits.h"
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#include "libc/mem/gc.h"
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#include "libc/runtime/runtime.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/o.h"
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#include "libc/temp.h"
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#include "libc/x/x.h"
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static char *get_pagerpath(char *pathbuf, size_t pathbufsz) {
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char *pagerpath;
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if (strcmp(nulltoempty(getenv("TERM")), "dumb") && isatty(0) && isatty(1) &&
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((pagerpath = commandv("less", pathbuf, pathbufsz)) ||
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(pagerpath = commandv("more", pathbuf, pathbufsz)) ||
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(pagerpath = commandv("more.exe", pathbuf, pathbufsz)) ||
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(pagerpath = commandv("more.com", pathbuf, pathbufsz)))) {
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return pagerpath;
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}
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return 0;
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}
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static bool run_pager(char *args[hasatleast 3]) {
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char16_t widepath[PATH_MAX];
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int n, pid;
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if (IsWindows() && !strcasecmp(args[0], "/C/Windows/System32/more.com") &&
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(((n = __mkntpath(args[1], widepath)) == -1) ||
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!(args[1] = gc(utf16to8(widepath, n, 0))))) {
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return false;
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}
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if ((pid = fork()) != -1) {
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putenv("LC_ALL=C.UTF-8");
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putenv("LESSCHARSET=utf-8");
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putenv("LESS=-RS");
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if (!pid) {
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execv(args[0], args);
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_Exit(127);
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}
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waitpid(pid, 0, 0);
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return true;
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}
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return false;
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}
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/**
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* Displays wall of text in terminal with pagination.
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*/
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void __paginate(int fd, const char *s) {
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int tfd;
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char *args[3] = {0};
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char tmppath[] = "/tmp/paginate.XXXXXX";
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char progpath[PATH_MAX];
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bool done;
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if ((args[0] = get_pagerpath(progpath, sizeof(progpath)))) {
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if ((tfd = mkstemp(tmppath)) != -1) {
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write(tfd, s, strlen(s));
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close(tfd);
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args[1] = tmppath;
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done = run_pager(args);
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unlink(tmppath);
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if (done) {
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return;
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}
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}
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}
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write(fd, s, strlen(s));
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}
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/**
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* Displays a file in terminal with pagination
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*/
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void __paginate_file(int fd, const char *path) {
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char *args[3] = {0};
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char progpath[PATH_MAX];
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if ((args[0] = get_pagerpath(progpath, sizeof(progpath)))) {
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args[1] = (char *)path;
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if (run_pager(args)) {
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return;
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}
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}
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int sfd = open(path, O_RDONLY);
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if (sfd != -1) {
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ssize_t n;
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while ((n = read(sfd, progpath, sizeof(progpath)) > 0)) {
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write(fd, progpath, n);
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}
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}
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close(sfd);
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}
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