slowcat.c

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—slowcat.c [2022/11/22 18:58] (actual) – creado peron
Línea 1: Línea 1:
 +<code c>
 +/*
 + * slowcat.c - slow down the display of a file
 + * copyright (c) 2001,2002,2007  dave w capella   All Rights Reserved
 + *
 + * distributed under the terms of the GNU Public license
 + *
 + * There is NO WARRANTY, and NO SUPPORT WHATSOEVER.
 + *
 + * building: make slowcat && mv slowcat $HOME/bin
 + * (assuming that you have a personal bin directory)
 + *
 + * usage: slowcat [-d usecs] filename
 + * where usecs is the number of micro-seconds to delay.
 + *
 + * feedback welcome. enjoy!
 + * ...dave
 + *
 + *
 + * 09/24/07 - modifications to include nanosleep, brian at landsberger.com
 + */
  
 +#include <stdio.h>
 +#include <stdlib.h>
 +#include <time.h>
 +
 +int debug = 0;
 +
 +int main(int argc, char **argv) {
 + int c;
 + unsigned long usecs,s;
 + FILE *fp;
 + char *fnam;
 +        struct timespec ts;
 +
 + if(argc != 2 && argc != 4) {
 + fprintf(stderr,"usage: %s [-d usecs] filename\n",argv[0]);
 + exit(1);
 + }
 +
 + if(argc == 4 ) {
 + if( !strncmp(argv[1],"-d",2) ) {
 + usecs = strtoul(argv[2],NULL,10);
 + if(usecs<=0 || usecs>500000L) {
 + usecs = 1;
 + }
 + }
 + if(debug) {
 + fprintf(stderr,"usecs: %lu\nAny key to continue.\n",usecs);
 + c = getchar();
 + }
 + fnam = argv[3];
 + }
 + /* set timespec */
 + ts.tv_sec=0;
 + ts.tv_nsec=usecs;
 +
 + if(argc == 2 ) {
 + fnam = argv[1];
 + }
 + fp = fopen(fnam,"r");
 + if(fp == NULL) {
 + fprintf(stderr,"usage: %s [-d usecs] filename\n",argv[0]);
 + exit(2);
 + }
 +
 + while( (c = fgetc(fp)) != EOF) {
 + putchar(c);
 +#ifdef _POSIX_C_SOURCE // assuming >= 199309L
 + if (debug) {
 + fprintf(stderr,"sleeping using nanosleep\n");
 + }
 + nanosleep(&ts,NULL);
 +#else  
 + if (debug) {
 + fprintf(stderr,"sleeping using for\n");
 + }
 + for(s=0;s<usecs;s++)
 + ;
 +#endif
 + }
 +
 + fclose(fp);
 + return (0);
 +}
 +</code>
  • slowcat.c.txt
  • Última modificación: 2022/11/22 18:58
  • por peron