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V1035. Only values returned from fgetpos() can be used as arguments to fsetpos().
As defined by the C standard, calling the 'fsetpos' function with an argument obtained not by the 'fgetpos' function leads to undefined behavior.
Consider the following example:
int foo()
{
FILE * pFile;
fpos_t position;
pFile = fopen("file.txt", "w");
memset(&position, 0, sizeof(position));
fputs("That is a sample", pFile);
fsetpos(pFile, &position);
fputs("This", pFile);
fclose(pFile);
return 0;
}Because the value of the 'position' variable was obtained not by the 'fgetpos' function, further program execution may fail.
Fixed code:
int foo()
{
FILE * pFile;
fpos_t position;
pFile = fopen("file.txt", "w");
fgetpos(pFile, &position);
fputs("That is a sample", pFile);
fsetpos(pFile, &position);
fputs("This", pFile);
fclose(pFile);
return 0;
}This diagnostic is classified as:
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