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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.
Augie Fackler - - Load All Authors

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r42778:97ada9b8 5.0.2 stable
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Makefile
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CC = clang
CXX = clang++
all: bdiff mpatch xdiff
fuzzutil.o: fuzzutil.cc fuzzutil.h
$(CXX) $(CXXFLAGS) -g -O1 \
-std=c++17 \
-I../../mercurial -c -o fuzzutil.o fuzzutil.cc
fuzzutil-oss-fuzz.o: fuzzutil.cc fuzzutil.h
$(CXX) $(CXXFLAGS) -std=c++17 \
-I../../mercurial -c -o fuzzutil-oss-fuzz.o fuzzutil.cc
pyutil.o: pyutil.cc pyutil.h
$(CXX) $(CXXFLAGS) -g -O1 \
`$$OUT/sanpy/bin/python-config --cflags` \
-I../../mercurial -c -o pyutil.o pyutil.cc
bdiff.o: ../../mercurial/bdiff.c
$(CC) $(CFLAGS) -fsanitize=fuzzer-no-link,address -c -o bdiff.o \
../../mercurial/bdiff.c
bdiff: bdiff.cc bdiff.o fuzzutil.o
$(CXX) $(CXXFLAGS) -DHG_FUZZER_INCLUDE_MAIN=1 -g -O1 -fsanitize=fuzzer-no-link,address \
-std=c++17 \
-I../../mercurial bdiff.cc bdiff.o fuzzutil.o -o bdiff
bdiff-oss-fuzz.o: ../../mercurial/bdiff.c
$(CC) $(CFLAGS) -c -o bdiff-oss-fuzz.o ../../mercurial/bdiff.c
bdiff_fuzzer: bdiff.cc bdiff-oss-fuzz.o fuzzutil-oss-fuzz.o
$(CXX) $(CXXFLAGS) -std=c++17 -I../../mercurial bdiff.cc \
bdiff-oss-fuzz.o fuzzutil-oss-fuzz.o -lFuzzingEngine -o \
$$OUT/bdiff_fuzzer
mpatch.o: ../../mercurial/mpatch.c
$(CC) -g -O1 -fsanitize=fuzzer-no-link,address -c -o mpatch.o \
../../mercurial/mpatch.c
mpatch: CXXFLAGS += -std=c++17
mpatch: mpatch.cc mpatch.o fuzzutil.o
$(CXX) $(CXXFLAGS) -DHG_FUZZER_INCLUDE_MAIN=1 -g -O1 -fsanitize=fuzzer-no-link,address \
-I../../mercurial mpatch.cc mpatch.o fuzzutil.o -o mpatch
mpatch-oss-fuzz.o: ../../mercurial/mpatch.c
$(CC) $(CFLAGS) -c -o mpatch-oss-fuzz.o ../../mercurial/mpatch.c
mpatch_fuzzer: mpatch.cc mpatch-oss-fuzz.o fuzzutil-oss-fuzz.o
$(CXX) $(CXXFLAGS) -std=c++17 -I../../mercurial mpatch.cc \
mpatch-oss-fuzz.o fuzzutil-oss-fuzz.o -lFuzzingEngine -o \
$$OUT/mpatch_fuzzer
mpatch_corpus.zip:
python mpatch_corpus.py $$OUT/mpatch_fuzzer_seed_corpus.zip
x%.o: ../../mercurial/thirdparty/xdiff/x%.c ../../mercurial/thirdparty/xdiff/*.h
$(CC) -g -O1 -fsanitize=fuzzer-no-link,address -c \
-o $@ \
$<
xdiff: CXXFLAGS += -std=c++17
xdiff: xdiff.cc xdiffi.o xprepare.o xutils.o fuzzutil.o
$(CXX) $(CXXFLAGS) -DHG_FUZZER_INCLUDE_MAIN=1 -g -O1 -fsanitize=fuzzer-no-link,address \
-I../../mercurial xdiff.cc \
xdiffi.o xprepare.o xutils.o fuzzutil.o -o xdiff
fuzz-x%.o: ../../mercurial/thirdparty/xdiff/x%.c ../../mercurial/thirdparty/xdiff/*.h
$(CC) $(CFLAGS) -c \
-o $@ \
$<
xdiff_fuzzer: xdiff.cc fuzz-xdiffi.o fuzz-xprepare.o fuzz-xutils.o fuzzutil-oss-fuzz.o
$(CXX) $(CXXFLAGS) -std=c++17 -I../../mercurial xdiff.cc \
fuzz-xdiffi.o fuzz-xprepare.o fuzz-xutils.o fuzzutil-oss-fuzz.o \
-lFuzzingEngine -o $$OUT/xdiff_fuzzer
manifest.o: ../../mercurial/cext/manifest.c
$(CC) $(CFLAGS) `$$OUT/sanpy/bin/python-config --cflags` \
-I../../mercurial \
-c -o manifest.o ../../mercurial/cext/manifest.c
charencode.o: ../../mercurial/cext/charencode.c
$(CC) $(CFLAGS) `$$OUT/sanpy/bin/python-config --cflags` \
-I../../mercurial \
-c -o charencode.o ../../mercurial/cext/charencode.c
parsers.o: ../../mercurial/cext/parsers.c
$(CC) $(CFLAGS) `$$OUT/sanpy/bin/python-config --cflags` \
-I../../mercurial \
-c -o parsers.o ../../mercurial/cext/parsers.c
dirs.o: ../../mercurial/cext/dirs.c
$(CC) $(CFLAGS) `$$OUT/sanpy/bin/python-config --cflags` \
-I../../mercurial \
-c -o dirs.o ../../mercurial/cext/dirs.c
pathencode.o: ../../mercurial/cext/pathencode.c
$(CC) $(CFLAGS) `$$OUT/sanpy/bin/python-config --cflags` \
-I../../mercurial \
-c -o pathencode.o ../../mercurial/cext/pathencode.c
revlog.o: ../../mercurial/cext/revlog.c
$(CC) $(CFLAGS) `$$OUT/sanpy/bin/python-config --cflags` \
-I../../mercurial \
-c -o revlog.o ../../mercurial/cext/revlog.c
manifest_fuzzer: manifest.cc manifest.o charencode.o parsers.o dirs.o pathencode.o revlog.o pyutil.o
$(CXX) $(CXXFLAGS) `$$OUT/sanpy/bin/python-config --cflags` \
-Wno-register -Wno-macro-redefined \
-I../../mercurial manifest.cc \
manifest.o charencode.o parsers.o dirs.o pathencode.o revlog.o pyutil.o \
-lFuzzingEngine `$$OUT/sanpy/bin/python-config --ldflags` \
-o $$OUT/manifest_fuzzer
manifest_corpus.zip:
python manifest_corpus.py $$OUT/manifest_fuzzer_seed_corpus.zip
revlog_fuzzer: revlog.cc manifest.o charencode.o parsers.o dirs.o pathencode.o revlog.o pyutil.o
$(CXX) $(CXXFLAGS) `$$OUT/sanpy/bin/python-config --cflags` \
-Wno-register -Wno-macro-redefined \
-I../../mercurial revlog.cc \
manifest.o charencode.o parsers.o dirs.o pathencode.o revlog.o pyutil.o \
-lFuzzingEngine `$$OUT/sanpy/bin/python-config --ldflags` \
-o $$OUT/revlog_fuzzer
revlog_corpus.zip:
python revlog_corpus.py $$OUT/revlog_fuzzer_seed_corpus.zip
dirstate_fuzzer: dirstate.cc manifest.o charencode.o parsers.o dirs.o pathencode.o revlog.o pyutil.o
$(CXX) $(CXXFLAGS) `$$OUT/sanpy/bin/python-config --cflags` \
-Wno-register -Wno-macro-redefined \
-I../../mercurial dirstate.cc \
manifest.o charencode.o parsers.o dirs.o pathencode.o revlog.o pyutil.o \
-lFuzzingEngine `$$OUT/sanpy/bin/python-config --ldflags` \
-o $$OUT/dirstate_fuzzer
dirstate_corpus.zip:
python dirstate_corpus.py $$OUT/dirstate_fuzzer_seed_corpus.zip
fm1readmarkers_fuzzer: fm1readmarkers.cc manifest.o charencode.o parsers.o dirs.o pathencode.o revlog.o pyutil.o
$(CXX) $(CXXFLAGS) `$$OUT/sanpy/bin/python-config --cflags` \
-Wno-register -Wno-macro-redefined \
-I../../mercurial fm1readmarkers.cc \
manifest.o charencode.o parsers.o dirs.o pathencode.o revlog.o pyutil.o \
-lFuzzingEngine `$$OUT/sanpy/bin/python-config --ldflags` \
-o $$OUT/fm1readmarkers_fuzzer
fm1readmarkers_corpus.zip:
python fm1readmarkers_corpus.py $$OUT/fm1readmarkers_fuzzer_seed_corpus.zip
clean:
$(RM) *.o *_fuzzer \
bdiff \
mpatch \
xdiff
oss-fuzz: bdiff_fuzzer mpatch_fuzzer mpatch_corpus.zip xdiff_fuzzer manifest_fuzzer manifest_corpus.zip revlog_fuzzer revlog_corpus.zip dirstate_fuzzer dirstate_corpus.zip fm1readmarkers_fuzzer fm1readmarkers_corpus.zip
.PHONY: all clean oss-fuzz