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display: report and catch a bad state, to prevent a possible hang

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Benno Schulenberg 2019-04-12 19:15:48 +02:00
parent bf6bcde078
commit c0e3779453
1 changed files with 7 additions and 0 deletions
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7
src/winio.c
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@ -1888,6 +1888,13 @@ char *display_string(const char *buf, size_t column, size_t span,
/* Allocate enough space for converting the relevant part of the line. */
converted = charalloc(strlen(buf) * (MAXCHARLEN + tabsize) + 1);
#ifndef NANO_TINY
if (span > HIGHEST_POSITIVE) {
statusline(ALERT, "Span has underflowed -- please report a bug");
converted[0] = '\0';
return converted;
}
#endif
/* If the first character starts before the left edge, or would be
* overwritten by a "<" token, then show placeholders instead. */
if (*buf != '\0' && *buf != '\t' && (start_col < column ||