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Fix two copy/paste bugs: forbid zero-length buffers to prevent a fatal error
when trying to paste them, found by me, and miscalculation of the start/end causing random fatal errors when copying in copy-mode, reported by sthen. ok sthen "put it in" deraadt
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@ -63,7 +63,7 @@ cmd_paste_buffer_exec(struct cmd *self, struct cmd_ctx *ctx)
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}
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}
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if (pb != NULL)
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if (pb != NULL && *pb->data != '\0')
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buffer_write(w->active->out, pb->data, strlen(pb->data));
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/* Delete the buffer if -d. */
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