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saturday work

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dtb 2023-12-10 01:32:32 -07:00
parent 02353836ca
commit b971bb1a40
1 changed files with 21 additions and 18 deletions
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39
wip/peek/peek.c
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@ -1,18 +1,21 @@
/* #include <errno.h> /* errno */
#include <stdio.h> /* fprintf(3), getc(3), putc(3), EOF */ #include <stdio.h> /* fprintf(3), getc(3), putc(3), EOF */
#include <stdlib.h> /* size_t */
#if !defined EX_OK || !defined EX_USAGE #if !defined EX_OK || !defined EX_USAGE
# include <sysexits.h> # include <sysexits.h>
#endif #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), STDIN_FILENO */ #include <unistd.h> /* getopt(3), write(2), STDERR_FILENO, STDIN_FILENO */
static char *program_name = "peek"; static char *program_name = "peek";
int main(int argc, char *argv[]){ int main(int argc, char *argv[]){
int c; int c;
int eof; int eof;
size_t i;
char include_eof; char include_eof;
char to_stderr; size_t j;
char to_stdout; int outputs[] = {0 /* stdout */, 0 /* stderr */, 0 /* -p */, 0};
struct termios t; struct termios t;
/* disable terminal echo */ /* disable terminal echo */
@ -26,10 +29,10 @@ int main(int argc, char *argv[]){
to_stdout = 0; to_stdout = 0;
while((c = getopt(argc, argv, "1enop:")) != -1) while((c = getopt(argc, argv, "1enop:")) != -1)
switch(c){ switch(c){
case '1': eof = '\n'; break; case '1': eof = '\n'; break;
case 'e': to_stderr = 1; break; case 'n': include_eof = 1; break;
case 'n': include_eof = 1; break; case 'o': outputs[0] = STDIN_FILENO; break;
case 'o': to_stdout = 1; break; case 'e': outputs[1] = STDERR_FILENO; break;
case 'p': printf("not yet implemented\n"); case 'p': printf("not yet implemented\n");
default: default:
fprintf(stderr, "Usage: %s (-1eno) (-p [program])\n", fprintf(stderr, "Usage: %s (-1eno) (-p [program])\n",
@ -37,18 +40,18 @@ int main(int argc, char *argv[]){
return EX_USAGE; return EX_USAGE;
} }
while((c = getc(stdin)) != eof){ /* permute non-zero outputs to front */
if(to_stdout && putc(c, stdout) != c) for(i = 0; i < (sizeof outputs) / (sizeof *outputs) - 1; ++i)
return EX_OK; /* broken pipe */ if(outputs[i] == 0)
if(to_stderr) for(j = 1; j < (sizeof outputs) / (sizeof *outputs);
putc(c, stderr); ++j)
} outputs[j - 1] = outputs[j];
if(include_eof && to_stdout) do{ if((c = getc(stdin)) != eof || include_eof)
putc(c, stdout); for(i = 0; outputs[i] != 0; ++i);
if(write(outputs[i], &c, 1) != 1)
if(include_eof && to_stderr) {/* errro */}
putc(c, stderr); }while(c != eof);
tcgetattr(STDIN_FILENO, &t); tcgetattr(STDIN_FILENO, &t);
t.c_lflag |= ECHO; t.c_lflag |= ECHO;