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#include <stdio.h>
#include <string.h>
FILE *f;
int c;
void main(int argc,char **argv) {
if (argc==3) {
if (stricmp(argv[1],"-a")) goto USAGE;
f=fopen(argv[2],"a");
if (NULL==f) goto FNULL;
goto FOK;
} else if (argc==2) {
if (0==strcmp(argv[1],"/?")) {
USAGE:
fprintf(stderr,"Usage: program | tee [-a] file\n");
return;
}
f=fopen(argv[1],"w");
if (NULL==f) goto FNULL;
FOK:
while (1) {
c=getchar();
if (EOF==c) break;
if (EOF==fputc(c,f)) {
putchar(c);
break;
} else {
if (EOF==putchar(c)) break;
}
}
fclose(f);
} else {
FNULL:
while (1) {
c=getchar();
if (EOF==c) break;
if (EOF==putchar(c)) break;
}
}
}