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.Dd July 26, 2015 .Dt EFUN 3 .Os .Sh NAME .Nm esetfunc , .Nm easprintf , .Nm efopen , .Nm emalloc , .Nm ecalloc , .Nm erealloc , .Nm ereallocarr , .Nm estrdup , .Nm estrndup , .Nm estrlcat , .Nm estrlcpy , .Nm estrtoi , .Nm estrtou , .Nm evasprintf .Nd error-checked utility functions .Sh LIBRARY .Lb libutil .Sh SYNOPSIS n util.h .Ft void (*)(int, const char *, ...) .Fn esetfunc "void (*)(int, const char *, ...)" .Ft int .Fn easprintf "char ** restrict str" "const char * restrict fmt" "..." .Ft FILE * .Fn efopen "const char *p" "const char *m" .Ft void * .Fn ecalloc "size_t n" "size_t s" .Ft void * .Fn emalloc "size_t n" .Ft void * .Fn erealloc "void *p" "size_t n" .Ft void .Fn ereallocarr "void *p" "size_t n" "size_t s" .Ft char * .Fn estrdup "const char *s" .Ft char * .Fn estrndup "const char *s" "size_t len" .Ft size_t .Fn estrlcat "char *dst" "const char *src" "size_t len" .Ft size_t .Fn estrlcpy "char *dst" "const char *src" "size_t len" .Ft intmax_t .Fn estrtoi "const char * nptr" "int base" "intmax_t lo" "intmax_t hi" .Ft uintmax_t .Fn estrtou "const char * nptr" "int base" "uintmax_t lo" "uintmax_t hi" .Ft int .Fn evasprintf "char ** restrict str" "const char * restrict fmt" "..." .Sh DESCRIPTION The .Fn easprintf , .Fn efopen , .Fn ecalloc , .Fn emalloc , .Fn erealloc , .Fn ereallocarr , .Fn estrdup , .Fn estrndup , .Fn estrlcat , .Fn estrlcpy , .Fn estrtoi , .Fn estrtou , and .Fn evasprintf functions operate exactly as the corresponding functions that do not start with an .Sq e except that in case of an error, they call the installed error handler that can be configured with .Fn esetfunc .
p For the string handling functions, it is an error when the destination buffer is not large enough to hold the complete string. For functions that allocate memory or open a file, it is an error when they would return a null pointer. The default error handler is .Xr err 3 . The function .Fn esetfunc returns the previous error handler function. A .Dv NULL error handler will just call .Xr exit 3 . .Sh SEE ALSO .Xr asprintf 3 , .Xr calloc 3 , .Xr err 3 , .Xr exit 3 , .Xr fopen 3 , .Xr malloc 3 , .Xr realloc 3 , .Xr reallocarr 3 , .Xr strdup 3 , .Xr strlcat 3 , .Xr strlcpy 3 , .Xr strndup 3 , .Xr strtoi 3 , .Xr strtou 3 , .Xr vasprintf 3 .Sh HISTORY The .Fn estrtoi , .Fn estrtou and .Fn ereallocarr functions were added in .Nx 8 .
Indexes created Sat Sep 20 22:09:52 GMT 2025