/usr/include/zsh/subst.epro is in zsh-dev 5.0.2-3ubuntu6.
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 | /* Generated automatically */
#ifndef have_Src_subst_globals
#define have_Src_subst_globals
extern char nulstring[];
extern mod_import_function void prefork _((LinkList list,int flags));
extern char*quotesubst _((char*str));
extern mod_import_function void globlist _((LinkList list,int nountok));
extern mod_import_function void singsub _((char**s));
extern mod_import_function void filesub _((char**namptr,int assign));
extern char*equalsubstr _((char*str,int assign,int nomatch));
extern mod_import_function int filesubstr _((char**namptr,int assign));
extern char*get_strarg _((char*s,int*lenp));
extern void modify _((char**str,char**ptr));
#endif /* !have_Src_subst_globals */
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