comparison mercurial/mpatch.c @ 38191:b8b253aec953 stable

mpatch: introduce a safesub() helper as well

Same reason as safeadd().

38190:1ec4cb8cbc87

				return false;
			}
		}
	}
	*dest += src;
	return true;
}

/* move hunks in source that are less cut to dest, compensating
   for changes in offset. the last hunk may be split if necessary.

38191:b8b253aec953

				return false;
			}
		}
	}
	*dest += src;
	return true;
}

/* subtract src from dest and store result in dest */
static inline bool safesub(int src, int *dest)
{
	if (((src > 0) && (*dest < INT_MIN + src)) ||
	    ((src < 0) && (*dest > INT_MAX + src))) {
		return false;
	}
	*dest -= src;
	return true;
}

/* move hunks in source that are less cut to dest, compensating
   for changes in offset. the last hunk may be split if necessary.