80 lines
2.1 KiB
C
80 lines
2.1 KiB
C
#include <assert.h> /* assert */
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#include <stdio.h> /* FILE* */
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#include <stdlib.h> /* malloc, free */
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#include <unistd.h> /* unlink */
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#include "io.h"
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/* <https://rosettacode.org/wiki/Read_entire_file#C> */
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char *file_read(const char *filename, size_t *readSize) {
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char *buffer;
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FILE *fh;
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long size;
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size_t nread;
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assert(filename != NULL);
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buffer = NULL;
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fh = fopen(filename, "rb");
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if (fh != NULL) {
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fseek(fh, 0L, SEEK_END);
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size = ftell(fh);
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rewind(fh);
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if (size > 0)
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buffer = (char *)malloc((size_t)size);
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if (buffer != NULL) {
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assert(buffer != NULL);
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nread = fread(buffer, 1, (size_t)size, fh);
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fclose(fh);
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fh = NULL;
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if (size != (long)nread) {
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free(buffer);
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buffer = NULL;
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}
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assert(size == (long)nread);
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if (NULL != readSize) {
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*readSize = nread;
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}
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}
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if (fh != NULL)
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fclose(fh);
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}
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return buffer;
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}
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/* <https://www.rosettacode.org/wiki/Write_entire_file#C> */
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size_t file_write(const char *fileName, const void *data, const size_t size) {
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size_t numberBytesWritten = 0;
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FILE *file;
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assert(fileName != NULL);
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assert(data != NULL);
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assert(size > 0);
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if (fileName != NULL && *fileName != '\0') {
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file = fopen(fileName, "wb");
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if (file != NULL) {
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if (data != NULL) {
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numberBytesWritten = fwrite(data, 1, size, file);
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}
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fclose(file);
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}
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}
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return numberBytesWritten;
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}
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int copy_file(const char *srcname, const char *dstname) {
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int rc;
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char *buf;
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size_t nread, nwrite;
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rc = -1;
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buf = file_read(srcname, &nread);
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if (buf) {
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nwrite = file_write(dstname, buf, nread);
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if (nread != nwrite) {
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fprintf(stderr, "Incorrect write size (%ld != %ld)\n", nread, nwrite);
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unlink(dstname);
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}
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assert(nread == nwrite);
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free(buf);
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rc = 0;
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}
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return rc;
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}
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