NGINX Unit - universal web app server - a lightweight and versatile open source server that simplifies the application stack by natively executing application code across eight different programming language runtimes.
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We had a mix of styles for declaring function-like macros: Style A: #define \ foo() \ do { \ ... \ } while (0) Style B: #define foo() \ do { \ ... \ } while (0) We had a similar number of occurences of each style: $ grep -rnI '^\w*(.*\\' | wc -l 244 $ grep -rn 'define.*(.*)' | wc -l 239 (Those regexes aren't perfect, but a very decent approximation.) Real examples: $ find src -type f | xargs sed -n '/^nxt_double_is_zero/,/^$/p' nxt_double_is_zero(f) \ (fabs(f) <= FLT_EPSILON) $ find src -type f | xargs sed -n '/define nxt_http_field_set/,/^$/p' #define nxt_http_field_set(_field, _name, _value) \ do { \ (_field)->name_length = nxt_length(_name); \ (_field)->value_length = nxt_length(_value); \ (_field)->name = (u_char *) _name; \ (_field)->value = (u_char *) _value; \ } while (0) I'd like to standardize on a single style for them, and IMO, having the identifier in the same line as #define is a better option for the following reasons: - Programmers are used to `#define foo() ...` (readability). - One less line of code. - The program for finding them is really simple (see below). function grep_ngx_func() { if (($# != 1)); then >&2 echo "Usage: ${FUNCNAME[0]} <func>"; return 1; fi; find src -type f \ | grep '\.[ch]$' \ | xargs grep -l "$1" \ | sort \ | xargs pcregrep -Mn "(?s)^\$[\w\s*]+?^$1\(.*?^}"; find src -type f \ | grep '\.[ch]$' \ | xargs grep -l "$1" \ | sort \ | xargs pcregrep -Mn "(?s)define $1\(.*?^$" \ | sed -E '1s/^[^:]+:[0-9]+:/&\n\n/'; } $ grep_ngx_func Usage: grep_ngx_func <func> $ grep_ngx_func nxt_http_field_set src/nxt_http.h:98: #define nxt_http_field_set(_field, _name, _value) \ do { \ (_field)->name_length = nxt_length(_name); \ (_field)->value_length = nxt_length(_value); \ (_field)->name = (u_char *) _name; \ (_field)->value = (u_char *) _value; \ } while (0) $ grep_ngx_func nxt_sprintf src/nxt_sprintf.c:56: u_char * nxt_cdecl nxt_sprintf(u_char *buf, u_char *end, const char *fmt, ...) { u_char *p; va_list args; va_start(args, fmt); p = nxt_vsprintf(buf, end, fmt, args); va_end(args); return p; } ................ Scripted change: ................ $ find src -type f \ | grep '\.[ch]$' \ | xargs sed -i '/define *\\$/{N;s/ *\\\n/ /;s/ //}' |
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NGINX Unit ---------- The documentation and binary packages are available online: http://unit.nginx.org The source code is provided under the terms of Apache License 2.0: http://hg.nginx.org/unit Please ask questions, report issues, and send patches to the mailing list: unit@nginx.org (http://mailman.nginx.org/mailman/listinfo/unit) or via Github: https://github.com/nginx/unit -- NGINX, Inc. http://nginx.com