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May 30, 2011 22:29
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K&R exercise 7-6 compare two files
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| #include <stdio.h> | |
| #include <stdlib.h> | |
| #include <string.h> | |
| #define MAXLINE 1000 | |
| int main(int argc, char *argv[]) | |
| { | |
| FILE *fileA, *fileB; | |
| char filenameA[257]; | |
| char filenameB[257]; | |
| char *prog = argv[0]; | |
| char bufferA[MAXLINE]; | |
| char bufferB[MAXLINE]; | |
| char *bA; | |
| char *bB; | |
| int comp = 0; | |
| int linenum = 0; | |
| if (argc != 3) | |
| { | |
| fprintf(stderr, "Usage\n%s fileA fileB\n", prog); | |
| exit(1); | |
| } | |
| if ((fileA = fopen(*++argv, "r")) == NULL) | |
| { | |
| fprintf(stderr, "%s: can't open %s\n", prog, *argv); | |
| exit(2); | |
| } else { | |
| strcpy(filenameA,*argv); | |
| } | |
| if ((fileB = fopen(*++argv, "r")) == NULL) | |
| { | |
| fprintf(stderr, "%s: can't open %s\n", prog, *argv); | |
| exit(2); | |
| } else { | |
| strcpy(filenameB,*argv); | |
| } | |
| while (!comp) | |
| { | |
| bA = fgets(bufferA, MAXLINE, fileA); | |
| bB = fgets(bufferB, MAXLINE, fileB); | |
| if (bA && bB) | |
| { | |
| comp = strcmp(bufferA, bufferB); | |
| linenum++; | |
| } else { | |
| comp = 1; | |
| } | |
| } | |
| if (bA && bB) | |
| { | |
| printf("Files differ at line %d:\n", linenum); | |
| printf("%s:\t%s", filenameA, bufferA); | |
| printf("%s:\t%s", filenameB, bufferB); | |
| } else { | |
| if (!bA && !bB) | |
| { | |
| printf("Files are the same\n"); | |
| } else if (!bA) | |
| { | |
| printf("%s differs after end of %s\n",filenameB, filenameA); | |
| printf("%s:\tEOF\n", filenameA); | |
| printf("%s:\t%s", filenameB, bufferB); | |
| } else if (!bB) | |
| { | |
| printf("%s differs after end of %s\n",filenameA, filenameB); | |
| printf("%s:\t%s", filenameA, bufferA); | |
| printf("%s:\tEOF\n", filenameB); | |
| } | |
| } | |
| fclose(fileA); | |
| fclose(fileB); | |
| return 0; | |
| } |
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