^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) #include <sys/select.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) #include <stdlib.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) #include <stdio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) #include <string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) #include <signal.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <sys/ioctl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include "pager.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include "run-command.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include "sigchain.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include "subcmd-config.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) * This is split up from the rest of git so that we can do
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) * something different on Windows.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) static int spawned_pager;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) static int pager_columns;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) void pager_init(const char *pager_env)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) subcmd_config.pager_env = pager_env;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) static const char *forced_pager;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) void force_pager(const char *pager)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) forced_pager = pager;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) static void pager_preexec(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) * Work around bug in "less" by not starting it until we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) * have real input
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) fd_set in;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) fd_set exception;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) FD_ZERO(&in);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) FD_ZERO(&exception);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) FD_SET(0, &in);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) FD_SET(0, &exception);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) select(1, &in, NULL, &exception, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) setenv("LESS", "FRSX", 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) static const char *pager_argv[] = { "sh", "-c", NULL, NULL };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) static struct child_process pager_process;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) static void wait_for_pager(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) fflush(stdout);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) fflush(stderr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) /* signal EOF to pager */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) close(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) close(2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) finish_command(&pager_process);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) static void wait_for_pager_signal(int signo)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) wait_for_pager();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) sigchain_pop(signo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) raise(signo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) void setup_pager(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) const char *pager = getenv(subcmd_config.pager_env);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) struct winsize sz;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) if (forced_pager)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) pager = forced_pager;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) if (!isatty(1) && !forced_pager)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) if (ioctl(1, TIOCGWINSZ, &sz) == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) pager_columns = sz.ws_col;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) if (!pager)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) pager = getenv("PAGER");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) if (!(pager || access("/usr/bin/pager", X_OK)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) pager = "/usr/bin/pager";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) if (!(pager || access("/usr/bin/less", X_OK)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) pager = "/usr/bin/less";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) if (!pager)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) pager = "cat";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) if (!*pager || !strcmp(pager, "cat"))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) spawned_pager = 1; /* means we are emitting to terminal */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) /* spawn the pager */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) pager_argv[2] = pager;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) pager_process.argv = pager_argv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) pager_process.in = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) pager_process.preexec_cb = pager_preexec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) if (start_command(&pager_process))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) /* original process continues, but writes to the pipe */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) dup2(pager_process.in, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) if (isatty(2))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) dup2(pager_process.in, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) close(pager_process.in);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) /* this makes sure that the parent terminates after the pager */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) sigchain_push_common(wait_for_pager_signal);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) atexit(wait_for_pager);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) int pager_in_use(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) return spawned_pager;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) int pager_get_columns(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) char *s;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) s = getenv("COLUMNS");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) if (s)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) return atoi(s);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) return (pager_columns ? pager_columns : 80) - 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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