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$ ./nsfinfo /tmp/does-not-exist.nsf > info.txt
$ echo $?
66
$ cat info.txt
fopen() failed

cc -c -g3 -ggdb -Werror -Wall -Wextra -Wformat-security -Waggregate-return -Wbad-function-cast -Wcast-align -Wdeclaration-after-statement -Wdisabled-optimization -Wfloat-equal -Winline -Wmissing-declarations -Wmissing-prototypes -Wnested-externs -Wold-style-definition -Wpacked -Wpointer-arith -Wredundant-decls -Wstrict-prototypes -Wunreachable-code -Wwrite-strings -o md5.o md5.c
cc -c -g3 -ggdb -Werror -Wall -Wextra -Wformat-security -Waggregate-return -Wbad-function-cast -Wcast-align -Wdeclaration-after-statement -Wdisabled-optimization -Wfloat-equal -Winline -Wmissing-declarations -Wmissing-prototypes -Wnested-externs -Wold-style-definition -Wpacked -Wpointer-arith -Wredundant-decls -Wstrict-prototypes -Wunreachable-code -Wwrite-strings -o sha256.o sha256.c
cc -g3 -ggdb -Werror -Wall -Wextra -Wformat-security -Waggregate-return -Wbad-function-cast -Wcast-align -Wdeclaration-after-statement -Wdisabled-optimization -Wfloat-equal -Winline -Wmissing-declarations -Wmissing-prototypes -Wnested-externs -Wold-style-definition -Wpacked -Wpointer-arith -Wredundant-decls -Wstrict-prototypes -Wunreachable-code -Wwrite-strings -o nsfinfo nsfinfo.c md5.o sha256.o
nsfinfo.c: In function 'my_MD5_File':
nsfinfo.c:107:2: error: 'for' loop initial declarations are only allowed in C99 mode
nsfinfo.c:107:2: note: use option -std=c99 or -std=gnu99 to compile your code
nsfinfo.c: In function 'my_SHA256_File':
nsfinfo.c:163:2: error: 'for' loop initial declarations are only allowed in C99 mode
make: *** [nsfinfo] Error 1

nsfinfo.c: In function 'main':
nsfinfo.c:235:2: error: implicit declaration of function 'getopt' [-Werror=implicit-function-declaration]
nsfinfo.c:235:2: error: nested extern declaration of 'getopt' [-Werror=nested-externs]
nsfinfo.c:247:10: error: 'optind' undeclared (first use in this function)
nsfinfo.c:247:10: note: each undeclared identifier is reported only once for each function it appears in
cc1: all warnings being treated as errors
make: *** [nsfinfo] Error 1