---
name: "tab"
section: "3"
platform: "macos"
package: "ksh"
version: "42"
release: "macOS 26.5"
platforms: ["macos"]
url: "https://new.carta.tech/tab"
---

# tab(3)

simple table lookup routines

## NAME

tab - simple table lookup routines

## SYNOPSIS

$1$2#include \<ast.h\>#include \<ast.h\>#include \<ast.h\>#include \<ast.h\>#include \<ast.h\>#include \<ast.h\>#include \<ast.h\>#include \<ast.h\>

$1$2int tabindex(const void\* tab, int size, const char\* name);int tabindex(const void\* tab, int size, const char\* name);int tabindex(const void\* tab, int size, const char\* name);int tabindex(const void\* tab, int size, const char\* name);int tabindex(const void\* tab, int size, const char\* name);int tabindex(const void\* tab, int size, const char\* name);int tabindex(const void\* tab, int size, const char\* name);int tabindex(const void\* tab, int size, const char\* name); $1$2void\* tablook(const void\* tab, int size, const char\* name);void\* tablook(const void\* tab, int size, const char\* name);void\* tablook(const void\* tab, int size, const char\* name);void\* tablook(const void\* tab, int size, const char\* name);void\* tablook(const void\* tab, int size, const char\* name);void\* tablook(const void\* tab, int size, const char\* name);void\* tablook(const void\* tab, int size, const char\* name);void\* tablook(const void\* tab, int size, const char\* name);

## DESCRIPTION

These routines do linear lookups in *small* tables (on the order of 32 elements). Each table element has a size of $1$2sizesizesizesizesizesizesizesize bytes and the beginning of the element points to a name that is matched by the lookup routines.

$1$2tabindextabindextabindextabindextabindextabindextabindextabindex returns the index of the table element in $1$2tabtabtabtabtabtabtabtab that matches $1$2namenamenamenamenamenamenamename If there is no match then $1$2-1-1-1-1-1-1-1-1 is returned.

$1$2tablooktablooktablooktablooktablooktablooktablooktablook returns a pointer to the table element in $1$2tabtabtabtabtabtabtabtab that matches $1$2namenamenamenamenamenamenamename If there is no match then $1$200000000 is returned.

## SEE ALSO

[hash(3)](/hash/3.md)