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peek(1): update style

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This commit is contained in:
dtb 2024-07-26 07:42:05 -06:00
parent 26558d6ffe
commit a927c39c06
Signed by: trinity
GPG Key ID: 34C0543BBB6AF81B
1 changed files with 50 additions and 41 deletions
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79
src/peek.c
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@ -20,60 +20,67 @@
#include <stdio.h> /* fprintf(3), fgetc(3), perror(3), fputc(3), stderr, stdin, #include <stdio.h> /* fprintf(3), fgetc(3), perror(3), fputc(3), stderr, stdin,
* stdout, EOF, NULL */ * stdout, EOF, NULL */
#include <stdlib.h> /* exit(3), EXIT_FAILURE */ #include <stdlib.h> /* exit(3), EXIT_FAILURE */
#if !defined EX_IOERR || !defined EX_OK || !defined EX_USAGE #include <sysexits.h> /* EX_IOERR, EX_OK, EX_USAGE */
# include <sysexits.h>
#endif
#include <termios.h> /* tcgetattr(3), tcsetattr(3), struct termios, ECHO */ #include <termios.h> /* tcgetattr(3), tcsetattr(3), struct termios, ECHO */
#include <unistd.h> /* getopt(3), isatty(3), STDIN_FILENO */ #include <unistd.h> /* getopt(3), isatty(3), STDIN_FILENO */
static char *program_name = "peek"; char *program_name = "peek";
/* Restores terminal echo; otherwise when a user ^Cs the terminal would /* Restores terminal echo; otherwise when a user ^Cs the terminal would
* continue to not display typed text. If sig isn't zero, this will terminate * continue to not display typed text. If sig isn't zero, this will terminate
* the program. */ * the program. */
static void restore_echo(int sig){ static void
restore_echo(int sig) {
static struct termios t; static struct termios t;
tcgetattr(STDIN_FILENO, &t); /* Failure isn't reported because this is the termination routine anyway;
* errors will be obvious. */
if (tcgetattr(STDIN_FILENO, &t) == 0) {
t.c_lflag |= ECHO; t.c_lflag |= ECHO;
tcsetattr(STDIN_FILENO, TCSAFLUSH, &t); (void)tcsetattr(STDIN_FILENO, TCSAFLUSH, &t);
}
/* If, for whatever ungodly reason, exit(3) returns, the user will notice if (sig != 0) { exit(EXIT_FAILURE); } /* Terminated by signal. */
* their typed characters on the screen. */
if(sig != 0)
exit(EXIT_FAILURE);
return; return;
} }
static int ioerr(char *s){ perror(s); restore_echo(0); return EX_IOERR; } static int
static int usage(char *s){ ioerr(char *argv0) {
fprintf(stderr, "Usage: %s (-1enot) (-p [program [arguments...]])\n", s); perror(argv0);
restore_echo(0);
return EX_IOERR;
}
static int
usage(char *argv0) {
(void)fprintf(stderr, "Usage: %s [-i]\n", argv0);
return EX_USAGE; return EX_USAGE;
} }
int main(int argc, char *argv[]){ int main(int argc, char *argv[]){
if (argc > 0) { /* option parsing */
if(argc < 1)
return usage(program_name);
{ /* option parsing */
char allow_nonterminals; char allow_nonterminals;
int c; int c;
program_name = argv[0];
allow_nonterminals = 0; allow_nonterminals = 0;
while((c = getopt(argc, argv, "i")) != -1) while ((c = getopt(argc, argv, "i")) != -1) {
switch (c) { switch (c) {
case 'i': allow_nonterminals = 1; break; case 'i': allow_nonterminals = 1; break;
default: return usage(argv[0]); default: return usage(argv[0]);
} }
}
if(argc > optind) if (argc > optind) { return usage(argv[0]); }
return usage(argv[0]);
if (!allow_nonterminals && isatty(STDIN_FILENO) != 1) { if (!allow_nonterminals && isatty(STDIN_FILENO) != 1) {
fprintf(stderr, "%s: Must be run in a terminal" (void)fprintf(
" (option -i skips this check)\n", argv[0]); stderr,
"%s: Must be run in a terminal (option -i skips this check)\n",
argv[0]
);
return EX_USAGE; return EX_USAGE;
} }
} }
@ -88,28 +95,30 @@ int main(int argc, char *argv[]){
struct sigaction act = { 0 }; struct sigaction act = { 0 };
act.sa_handler = restore_echo; act.sa_handler = restore_echo;
if(sigaction(SIGINT, &act, NULL) != 0) if(sigaction(SIGINT, &act, NULL) != 0) { perror(program_name); }
perror(argv[0]);
#else #else
if(signal(SIGINT, restore_echo) == SIG_ERR) if(signal(SIGINT, restore_echo) == SIG_ERR) { perror(program_name); }
perror(argv[0]);
#endif #endif
} }
{ /* banish terminal echo */ /* Banish terminal echo; this terminates when it fails, because this is the
* whole point of the program. */
{
struct termios t; struct termios t;
tcgetattr(STDIN_FILENO, &t); if (tcgetattr(STDIN_FILENO, &t) != 0) { return ioerror(program_name); }
t.c_lflag ^= ECHO; t.c_lflag ^= ECHO;
tcsetattr(STDIN_FILENO, TCSAFLUSH, &t); if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &t) != 0) {
return ioerror(program_name);
}
} }
{ /* actual input loop */ { /* Input loop */
int c; int c;
while((c = fgetc(stdin)) != EOF) while ((c = fgetc(stdin)) != EOF) {
if(fputc(c, stdout) == EOF) if(fputc(c, stdout) == EOF) { return ioerr(program_name); }
return ioerr(argv[0]); }
} }
restore_echo(0); restore_echo(0);