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/* dedupe --crb3 07apr97/08may03/31Mar07 a short and simple filter I brought over from my Turbo-C (DOS) stuff, where I wrote the original somewhere around 1990. takes in a (sorted) stream of lines at stdin. emits all but the duplicates. /home/crb3/crb3/c/tool/ gcc -o dedupe dedupe.c */ #include <unistd.h> #include <ctype.h> #include <stdio.h> #include <string.h> #define MAXLINE 1024+1 main() { char *px,*py,*ptemp; char bufa[MAXLINE+1],bufb[MAXLINE+1]; px=bufa; py=bufb; bufa[0]=0; bufb[0]=0; while(fgets(px,MAXLINE,stdin) != NULL) { if(strcmp(px,py)) fputs(px,stdout); ptemp=py; py=px; px=ptemp; /* swap pointers. */ } } |
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