/usr/include/zsh/string.epro is in zsh-dev 5.1.1-1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 | /* Generated automatically */
#ifndef have_Src_string_globals
#define have_Src_string_globals
extern mod_import_function char*dupstring _((const char*s));
extern mod_import_function char*ztrdup _((const char*s));
#ifdef MULTIBYTE_SUPPORT
extern mod_import_function wchar_t*wcs_ztrdup _((const wchar_t*s));
#endif /* MULTIBYTE_SUPPORT */
extern mod_import_function char*tricat _((char const*s1,char const*s2,char const*s3));
extern mod_import_function char*zhtricat _((char const*s1,char const*s2,char const*s3));
extern mod_import_function char*dyncat _((const char*s1,const char*s2));
extern mod_import_function char*bicat _((const char*s1,const char*s2));
extern mod_import_function char*dupstrpfx _((const char*s,int len));
extern mod_import_function char*ztrduppfx _((const char*s,int len));
extern mod_import_function char*appstr _((char*base,char const*append));
extern mod_import_function char*strend _((char*str));
#endif /* !have_Src_string_globals */
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