57 lines
1.2 KiB
C
57 lines
1.2 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#if !defined EX_USAGE || !defined EX_SOFTWARE
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# include <sysexits.h>
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#endif
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/* Done while looking at plan9ports' src/cmd/p.c.
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* Taken from plan9 are the interface (minus p(1)'s shell escaping and the
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* ability to page multiple files) and the practice of reading /dev/tty to get
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* keyboard input without going through stdin. Also, a newline is now printed
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* before querying the keyboard. */
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static size_t l = 22; /* plan9 default */
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static char *program_name = "p";
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static int print_lines(FILE *f, size_t l){
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int c;
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while((c = getc(f)) != EOF)
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if((c = putc(c, stdout)) == EOF || (l -= (c == '\n')) == 0)
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break;
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return c;
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}
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int main(int argc, char *argv[]){
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unsigned char cmd[99+1];
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char *p;
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FILE *t;
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if(argc == 0)
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argv = &program_name;
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if(argc > 1){
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fprintf(stderr, "Usage: %s\n", argv[0]);
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return EX_USAGE;
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}
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if((t = fopen("/dev/tty", "rb")) == NULL){
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fprintf(stderr, "%s: Could not open /dev/tty\n", argv[0]);
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return EX_SOFTWARE;
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}
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while(print_lines(stdin, l) != EOF){
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fgets(cmd, (sizeof cmd) / (sizeof *cmd), t);
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for(p = cmd; *p != '\0' && strchr(" \t", *p) != NULL; ++p);
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if(feof(t) || (*p | 32) == 'q')
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break;
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}
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exit: fclose(t);
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return 0;
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}
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