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posix: always seek to EOF when opening a file in append mode...
posix: always seek to EOF when opening a file in append mode
Python 3 already does this, so skip it there.
Consider the program:
#include <stdio.h>
int main() {
FILE *f = fopen("narf", "w");
fprintf(f, "narf\n");
fclose(f);
f = fopen("narf", "a");
printf("%ld\n", ftell(f));
fprintf(f, "troz\n");
printf("%ld\n", ftell(f));
return 0;
}
on macOS, FreeBSD, and Linux with glibc, this program prints
5
10
but on musl libc (Alpine Linux and probably others) this prints
0
10
By my reading of
https://pubs.opengroup.org/onlinepubs/009695399/functions/fopen.html
this is technically correct, specifically:
> Opening a file with append mode (a as the first character in the
> mode argument) shall cause all subsequent writes to the file to be
> forced to the then current end-of-file, regardless of intervening
> calls to fseek().
in other words, the file position doesn't really matter in append-mode
files, and we can't depend on it being at all meaningful unless we
perform a seek() before tell() after open(..., 'a'). Experimentally
after a .write() we can do a .tell() and it'll always be reasonable,
but I'm unclear from reading the specification if that's a smart thing
to rely on. This matches what we do on Windows and what Python 3 does
for free, so let's just be consistent. Thanks to Yuya for the idea.
"string":"{\"result\":{\"errors\":[],\"fields\":{\"title\":\"create alpha for phabricator test \\u20ac\"},\"revisionIDFieldInfo\":{\"value\":null,\"validDomain\":\"https:\\/\\/phab.mercurial-scm.org\"}},\"error_code\":null,\"error_info\":null}"
"string":"{\"result\":[{\"id\":\"6054\",\"phid\":\"PHID-DREV-6pczsbtdpqjc2nskmxwy\",\"title\":\"create alpha for phabricator test \\u20ac\",\"uri\":\"https:\\/\\/phab.mercurial-scm.org\\/D6054\",\"dateCreated\":\"1551571947\",\"dateModified\":\"1551571947\",\"authorPHID\":\"PHID-USER-5iy6mkoveguhm2zthvww\",\"status\":\"0\",\"statusName\":\"Needs Review\",\"properties\":[],\"branch\":null,\"summary\":\"\",\"testPlan\":\"\",\"lineCount\":\"1\",\"activeDiffPHID\":\"PHID-DIFF-allzuauvigfjpv4z6dpi\",\"diffs\":[\"14303\"],\"commits\":[],\"reviewers\":{\"PHID-PROJ-3dvcxzznrjru2xmmses3\":\"PHID-PROJ-3dvcxzznrjru2xmmses3\"},\"ccs\":[\"PHID-USER-q42dn7cc3donqriafhjx\"],\"hashes\":[],\"auxiliary\":{\"phabricator:projects\":[],\"phabricator:depends-on\":[]},\"repositoryPHID\":\"PHID-REPO-bvunnehri4u2isyr7bc3\",\"sourcePath\":null}],\"error_code\":null,\"error_info\":null}"