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fix: correct write count in savePPM

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Previously, the `fwrite` call always returned 3 if it succeeded, and so `savePPM` would return 1 even if the entire pixel buffer was successfully written to file (except in the trivial case `sx * sy == 1`). This changes `savePPM` to return 0 if it was successful.
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Alex Chew 2022-07-17 11:09:29 -07:00 committed by GitHub
parent 91ba293616
commit 629e68cabf
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 3 additions and 2 deletions
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util.c
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@ -470,9 +470,10 @@ int savePPM(const char *path, const unsigned char *pixels, const unsigned int sx
if (!fp) if (!fp)
return -1; return -1;
fprintf(fp, "P6\n%d %d\n255\n", sx, sy); fprintf(fp, "P6\n%d %d\n255\n", sx, sy);
int written = fwrite(pixels, sx*sy, 3, fp); size_t pixelsLen = 3 * sx * sy;
size_t written = fwrite(pixels, sizeof pixels[0], pixelsLen, fp);
fclose(fp); fclose(fp);
return (unsigned int)written != 3*sx*sy; return written != pixelsLen;
} }