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Copy pathTask 38 (goto).c
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Copy pathTask 38 (goto).c
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97 lines (87 loc) · 2.1 KB
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// github.com/andy489
#include <stdlib.h>
#include <err.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdint.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
int main(int argc, char **argv){
if(argc != 3)
errx(1, "Invalid number of arguments. Usage: %s [OPTION] SET1 [SET2]", argv[0]);
int d, s;
char *set1 = NULL, *set2 = NULL;
d = (strcmp(argv[1],"-d") == 0)? 1:0;
s = (strcmp(argv[1],"-s") == 0)? 1:0;
if (!d && !s){
set1 = argv[1];
set2 = argv[2];
} else set1 = argv[2];
if(d){ //printf("we are in option: -d (errors start from 10)\n");
ssize_t len = strlen(set1);
ssize_t rd = -1;
char c;
ssize_t i;
OUTTER1: while( (rd = read(0, &c, 1)) == 1){
for(i = 0; i < len; ++i)
if(c == set1[i])
goto OUTTER1;
ssize_t wr = write(1, &c, 1);
if(wr == -1)
err(10, "error while writing to STDOUT");
}
if(rd == -1)
err(11, "error while reading from STDIN");
exit(0);
}
if(s){ //printf("we are in option: -s (errors start from 20)\n");
ssize_t len = strlen(set1);
ssize_t rd = -1, wr = -1;
char c, old_c = '\0';
ssize_t i, flag = 1;
OUTTER2: while ( (rd = read(0, &c, 1)) == 1){
if(flag) {
wr = write(1, &c, 1);
if(wr == -1)
err(20,"error while writing to STDOUT");
flag = 0;
old_c = c;
continue;
}
for(i = 0; i < len; ++i){
if(set1[i] == c && old_c == c)
goto OUTTER2;
}
wr = write(1, &c, 1);
if(wr == -1)
err(21, "error while writing to STDOUT");
old_c = c;
}
if(rd == -1)
err(22, "error while reading from STDIN");
exit(0);
}
//printf("we are in option 3: [SET1] [SET2] (errors start from 30)\n");
if(strlen(set1) != strlen(set2))
errx(30, "sizes of sets are not consistent");
ssize_t len = strlen(set1);
ssize_t rd = -1, wr = -1;
char c;
ssize_t i;
while( (rd = read(0, &c, 1)) == 1){
char copy = c;
for(i = 0; i < len; ++i){
if(copy == set1[i])
c = set2[i];
}
wr = write(1, &c, 1);
if(wr == -1)
err(31, "error while writing to STDOUT");
}
if(rd == -1)
err(32,"error while reading from STDIN");
exit(0);
}