sunday work
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952aa9cfee
@ -1,11 +1,13 @@
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/* #include <errno.h> /* errno */
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#include <stdio.h> /* fprintf(3), getc(3), putc(3), EOF */
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#include <stdlib.h> /* size_t */
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#if !defined EX_OK || !defined EX_USAGE
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#include <string.h> /* strerror(3) */
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#if !defined EX_OK || !defined EX_OSERR || !defined EX_USAGE
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# include <sysexits.h>
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#endif
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#include <termios.h> /* tcgetattr(3), tcsetattr(3), struct termios, ECHO */
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#include <unistd.h> /* getopt(3), write(2), STDERR_FILENO, STDIN_FILENO */
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#include <unistd.h> /* fork(2), getopt(3), pipe(2), write(2), STDERR_FILENO,
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* STDOUT_FILENO */
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static char *program_name = "peek";
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@ -14,43 +16,68 @@ int main(int argc, char *argv[]){
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int eof;
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size_t i;
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char include_eof;
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size_t j;
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int outputs[] = {0 /* stdout */, 0 /* stderr */, 0 /* -p */, 0};
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int outputs[] = {0 /* stdout */, 0 /* stderr */, 0 /* -p */};
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int p[2] = {0, 0};
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struct termios t;
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/* disable terminal echo */
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/* terminal echo */
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tcgetattr(STDIN_FILENO, &t);
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t.c_lflag ^= ECHO;
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tcsetattr(STDIN_FILENO, TCSAFLUSH, &t);
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if(argc < 1)
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argv[0] = program_name;
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eof = EOF;
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include_eof = 0;
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to_stderr = 0;
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to_stdout = 0;
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while((c = getopt(argc, argv, "1enop:")) != -1)
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switch(c){
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case '1': eof = '\n'; break;
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case 'n': include_eof = 1; break;
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case 'o': outputs[0] = STDIN_FILENO; break;
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case 'o': outputs[0] = STDOUT_FILENO; break;
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case 'e': outputs[1] = STDERR_FILENO; break;
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case 'p': printf("not yet implemented\n");
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case 'p':
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printf("not implemented\n"); return;
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if(pipe(p) != 0){
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fprintf(stderr, "%s: %s\n",
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argv[0] == NULL
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? program_name
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: argv[0],
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strerror(errno));
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return EX_OSERR;
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}else
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outputs[2] = p[1];
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break;
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default:
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fprintf(stderr, "Usage: %s (-1eno) (-p [program])\n",
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argv[0] == NULL ? program_name : argv[0]);
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return EX_USAGE;
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}
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/* permute non-zero outputs to front */
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for(i = 0; i < (sizeof outputs) / (sizeof *outputs) - 1; ++i)
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if(outputs[i] == 0)
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for(j = 1; j < (sizeof outputs) / (sizeof *outputs);
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++j)
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outputs[j - 1] = outputs[j];
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if(outputs[2] != 0){
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switch(fork()){
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case -1:
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fprintf(stderr, "%s: %s\n", argv[0], strerror(errno));
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return EX_OSERR;
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case 0:
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if(dup2(p[0], STDIN_FILENO) != STDIN_FILENO){
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fprintf(stderr, "%s: %s\n",
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argv[0] == NULL
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? program_name
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: argv[0],
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strerror(errno));
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return EX_OSERR;
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}
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/* exec */
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}
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}
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do{ if((c = getc(stdin)) != eof || include_eof)
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for(i = 0; outputs[i] != 0; ++i);
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if(write(outputs[i], &c, 1) != 1)
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{/* errro */}
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for(i = 0; i < (sizeof outputs)/(sizeof *outputs); ++i)
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if(outputs[i] != 0
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&& write(outputs[i], &c, 1)
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!= 1)
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{/* errno */}
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}while(c != eof);
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tcgetattr(STDIN_FILENO, &t);
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