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Make sure we do not underflow

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Sebastian Ramacher 2013-11-22 06:23:22 +01:00
parent badc0e2815
commit 4c88e9d1ef
1 changed files with 6 additions and 1 deletions
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7
adjustment.c
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@ -69,7 +69,12 @@ position_to_page_number(zathura_document_t* document, double pos_x,
unsigned int col = floor(pos_x * (double)doc_width / (double)(cell_width + pad)); unsigned int col = floor(pos_x * (double)doc_width / (double)(cell_width + pad));
unsigned int row = floor(pos_y * (double)doc_height / (double)(cell_height + pad)); unsigned int row = floor(pos_y * (double)doc_height / (double)(cell_height + pad));
return ncol * (row % nrow) + (col % ncol) - (c0 - 1); unsigned int page = ncol * (row % nrow) + (col % ncol);
if (page < c0 - 1) {
return 0;
} else {
return page - (c0 - 1);
}
} }