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LINE_MAX only applies to teletypes in canonical mode: when stdin is a file, it could still very much tear; start off at 512 for the sprintf(), then use getline() like in write. The line wrapping has one suboptimal edge-case: $ wall < all Broadcast message from nabijaczleweli@tarta (pts/4) (Tue Mar 14 22:31:25 2023): ^N^O^P^Q^R^S^T^U^V^W^X^Y^Z^[^\^]^^^_ !"#$%&'()*+,-./0123456789:;<=>?@abcdefghij KLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~^?\200\201\202\203\204\205\206 \207\210\211\212\213\214\215\216\217\220\221\222\223\224\225\226\227\230\231\232 \233\234\235\236\237\240\241\242\243\244\245\246\247\250\251\252\253\254\255\256 \257\260\261\262\263\264\265\266\267\270\271\272\273\274\275\276\277\300\301\302 \303\304\305\306\307\310\311\312\313\314\315\316\317\320\321\322\323\324\325\326 \327\330\331\332\333\334\335\336\337\340\341\342\343\344\345\346\347\350\351\352 \353\354\355\356\357\360\361\362\363\364\365\366\367\370\371\372\373\374\375\376 \377 but that's a pathological input, and the result is still infinitely better than it was before, so fixing that is more trouble than it's worth. Bug-Debian: https://bugs.debian.org/826596
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