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iceprog: Allow programming from pipe

This commit is contained in:
Roland Lutz 2017-06-08 14:11:53 +02:00
parent 0bd8876d7f
commit 8413b2c689
1 changed files with 48 additions and 8 deletions
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56
iceprog/iceprog.c
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@ -489,14 +489,54 @@ int main(int argc, char **argv)
err(EXIT_FAILURE,
"can't open '%s' for reading", filename);
if (!prog_sram && !check_mode && !dont_erase && !bulk_erase) {
if (fseek(f, 0L, SEEK_END) == -1)
err(EXIT_FAILURE, "%s: fseek", filename);
file_size = ftell(f);
if (file_size == -1)
err(EXIT_FAILURE, "%s: ftell", filename);
if (fseek(f, 0L, SEEK_SET) == -1)
err(EXIT_FAILURE, "%s: fseek", filename);
/* For regular programming, we need to read the file
twice--once for programming and once for verifying--and
need to know the file size in advance in order to erase
the correct amount of memory.
See if we can seek on the input file. Checking for "-"
as an argument isn't enough as we might be reading from a
named pipe, or contrarily, the standard input may be an
ordinary file. */
if (!prog_sram && !check_mode) {
if (fseek(f, 0L, SEEK_END) != -1) {
file_size = ftell(f);
if (file_size == -1)
err(EXIT_FAILURE,
"%s: ftell", filename);
if (fseek(f, 0L, SEEK_SET) == -1)
err(EXIT_FAILURE,
"%s: fseek", filename);
} else {
FILE *pipe = f;
f = tmpfile();
if (f == NULL)
errx(EXIT_FAILURE,
"can't open temporary file");
file_size = 0;
while (true) {
static unsigned char buffer[4096];
size_t rc =
fread(buffer, 1, 4096, pipe);
if (rc <= 0)
break;
size_t wc =
fwrite(buffer, 1, rc, f);
if (wc != rc)
errx(EXIT_FAILURE,
"can't write to "
"temporary file");
file_size += rc;
}
fclose(pipe);
/* now seek to the beginning so we can
start reading again */
fseek(f, 0, SEEK_SET);
}
}
}