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#include <stdio.h> #include <string.h> #include <stdlib.h> CSR_encrypt() { printf("encrypt function\n"); } CSR_decrypt() { printf("decrypt function\n"); } main(int argc, char *argv[]) { char *prg=argv[0]; char *opt=argv[1]; char *msg=argv[2]; if(argc==1) { fprintf(stderr, "%s: no option and massage\n", prg); exit(3); } if(argc==2) { fprintf(stderr, "%s: no option or message\n", prg); exit(2); } if(argc==3) { if(strcmp(opt,"-Ecsr")==0) CSR_encrypt(); else if(strcmp(opt,"-Dcsr")==0) CSR_decrypt(); else { fprintf(stderr, "%s: illegal option: %s\n", prg, opt); exit(1); } } exit(0); }
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