5249138dcd
* Patched crt0 to support a pre_main * pre_main sets up environment variables, can do other things later, but then just jumps to main with the same arguments. * Updated a bunch of apps to pass environment variables around.
45 lines
921 B
C
45 lines
921 B
C
/*
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* verify-write
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*
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* A dangerous tool to write to a file and verified it worked.
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*/
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#include <stdio.h>
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#include <unistd.h>
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#define CHUNK_SIZE 1024
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int main(int argc, char * argv[]) {
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if (argc < 3) {
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printf("Expected two arguments, the file to read, and the filename to write out to.\nTry again, maybe?\n");
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return -1;
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}
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FILE * input = fopen(argv[1], "r");
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FILE * output = fopen(argv[2], "w");
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size_t length;
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fseek(input, 0, SEEK_END);
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length = ftell(input);
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fseek(input, 0, SEEK_SET);
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char buf[CHUNK_SIZE];
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while (length > CHUNK_SIZE) {
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fread( buf, 1, CHUNK_SIZE, input);
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fwrite(buf, 1, CHUNK_SIZE, output);
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fflush(output);
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length -= CHUNK_SIZE;
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}
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if (length > 0) {
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fread( buf, 1, length, input);
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fwrite(buf, 1, length, output);
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fflush(output);
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}
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fclose(output);
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fclose(input);
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char * args[] = {"/bin/compare", argv[1], argv[2], NULL };
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execvp(args[0], args);
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return 0;
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}
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