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#include<stdio.h> | |
#include<stdlib.h> | |
#include<string.h> | |
int main(int argc, char **argv){ | |
if( argc != 2 ){ | |
puts("ERROR! expected exactly 1 argument"); | |
exit(1); | |
} | |
printf("Opening file '%s'\n", argv[1]); | |
FILE *f = fopen(argv[1], "r+b"); | |
if( ! f ){ | |
printf("Failed to open file\n"); | |
exit(1); | |
} | |
char read[100]; | |
// Replace line | |
// SET lock_timeout = 0; | |
// With | |
// --T lock_timeout = 0; | |
if( fseek(f, 62, SEEK_SET) ){ | |
printf("First seek failed\n"); | |
exit(1); | |
} | |
// check line before destroying | |
char *exp1 = "SET lock_timeout = 0;"; | |
if( fread(read, 1, 21, f) != 21 ){ | |
printf("First read failed\n"); | |
exit(1); | |
} | |
if( strncmp(exp1, read, 21) ){ | |
printf("First strncmp failed\n"); | |
exit(1); | |
} | |
if( fseek(f, 62, SEEK_SET) ){ | |
printf("First re-seek failed\n"); | |
exit(1); | |
} | |
// comment out line | |
if( fwrite("--", 1, 2, f) != 2 ){ | |
printf("First write failed\n"); | |
exit(1); | |
} | |
if( fseek(f, 406, SEEK_SET) ){ | |
printf("Second seek failed\n"); | |
exit(1); | |
} | |
// Replace line | |
char * exp2 = "CREATE EXTENSION IF NOT EXISTS plpgsql WITH SCHEMA pg_catalog;"; | |
// With | |
char * line = "CREATE PROCEDURAL LANGUAGE plpgsql;---------------------------"; | |
if( fread(read, 1, 62, f) != 62 ){ | |
printf("Second read failed\n"); | |
exit(1); | |
} | |
if( strncmp(exp2, read, 62) ){ | |
printf("Second strncmp failed\n"); | |
read[62] = '\0'; | |
printf("Expected '%s'\n", exp2); | |
printf("Got '%s'\n", read); | |
exit(1); | |
} | |
if( fseek(f, 406, SEEK_SET) ){ | |
printf("Second re-seek failed\n"); | |
exit(1); | |
} | |
// comment out line | |
if( fwrite(line, 1, 62, f) != 62 ){ | |
printf("Second write failed\n"); | |
exit(1); | |
} | |
puts("Success"); | |
fclose(f); | |
} |