B (programming language)

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B is a programming language that was developed at Bell Labs. It is almost extinct, as it was replaced with the C language. It was mostly the work of Ken Thompson, with contributions from Dennis Ritchie, and first appeared circa 1969.

Contents

History

Ken Thompson wrote B basing it mainly on the BCPL language he had used to write Unix while in the MULTICS project. B was essentially the BCPL system stripped of any component that Thompson felt he could do without, in order to make it fit within the memory capacity of the minicomputers of the time. The language also included some changes made to suit Thompson's preferences (mostly along the lines of reducing the number of non-whitespace characters in a typical program).

Like BCPL and FORTH, B had only one datatype: the computer word. Most operators (e.g., +, -, *, /) treated this as an integer, but others treated it as a memory address to be dereferenced. In most other ways it looked a lot like an early version of C. A few library functions existed, including some that vaguely resemble functions from the standard I/O library in C.

Early implementations were for the DEC PDP-7 and PDP-11 minicomputers using early Unix, and Honeywell 36-bit mainframes running the operating system GCOS. The earliest PDP-7 implementations compiled to threaded code, and then Ritchie wrote a compiler using TMG which produced machine code.[1][2] In 1970 a PDP-11 was acquired and threaded code was used for the port. The first version of yacc was produced with this PDP-11 configuration. Ritchie took over maintenance during this period.

The typeless nature of B made sense on the Honeywell, PDP-7 and many older computers, but was a problem on the PDP-11 because it was difficult to elegantly access the character data type that the PDP-11 and most modern computers fully support. Starting in 1971 Ritchie made changes to the language while converting its compiler to produce machine code, most notably adding data typing for variables. During 1971 and 1972 B evolved into "New B" and then C, with the preprocessor being added in 1972 and early 1973 at the urging of Alan Snyder. The effort was sufficiently complete that during the summer of 1973 the Unix kernel for the PDP-11 was rewritten in C. During the 1972–73 period there was a need to port to Honeywell 635 and IBM 360/370 machines, so Mike Lesk wrote the "portable I/O package" which would become the C "standard I/O" routines.

B continued to see use as late as the 1990s on Honeywell mainframes, and on certain embedded systems for a variety of reasons, including limited hardware in the small systems; extensive libraries, tools, licensing cost issues; and simply being good enough for the job on others. The highly influential AberMUD was originally written in B.

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