diff options
| -rw-r--r-- | src/internal/argv/argv.h | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/src/internal/argv/argv.h b/src/internal/argv/argv.h index 994b79f..a6267b3 100644 --- a/src/internal/argv/argv.h +++ b/src/internal/argv/argv.h @@ -735,6 +735,141 @@ static void argv_usage( const struct argv_option options[], const char * mode) { + const struct argv_option * option; + bool fshort,flong,fboth; + size_t len,optlen,desclen; + char cache; + char * prefix; + char * desc; + char * mark; + char * cap; + char description[4096]; + char optstr [72]; + const size_t optcap = 64; + const size_t width = 80; + const char indent[] = " "; + + fshort = mode ? !strcmp(mode,"short") : 0; + flong = fshort ? 0 : mode && !strcmp(mode,"long"); + fboth = !fshort && !flong; + + if (header) + fprintf(stdout,"%s",header); + + option = options; + optlen = 0; + + for (; option->short_name || option->long_name; option++) { + /* indent + comma */ + len = fboth ? sizeof(indent) + 1 : sizeof(indent); + + /* -o */ + if (fshort || fboth) + len += option->short_name + ? 2 : 0; + + /* --option */ + if (flong || fboth) + len += option->long_name + ? 2 + strlen(option->long_name) : 0; + + /* optlen */ + if (len > optlen) + optlen = len; + } + + if (optlen >= optcap) { + fprintf(stderr, + "Option strings exceed %zu characters, " + "please generate the usage screen manually.\n", + optcap); + return; + } + + optlen += ARGV_TAB_WIDTH; + optlen &= (~(ARGV_TAB_WIDTH-1)); + desclen = (optlen < width / 2) ? width - optlen : optlen; + + for (option=options; option->short_name || option->long_name; option++) { + /* description, using either paradigm or argname if applicable */ + snprintf(description,sizeof(description),option->description, + option->paradigm + ? option->paradigm + : option->argname ? option->argname : ""); + description[sizeof(description)-1] = 0; + + /* long/hybrid option prefix (-/--) */ + prefix = option->flags & ARGV_OPTION_HYBRID_ONLY + ? " -" : "--"; + + /* option string */ + if (fboth && option->short_name && option->long_name) + sprintf(optstr,"%s-%c,%s%s", + indent,option->short_name,prefix,option->long_name); + + else if ((fshort || fboth) && option->short_name) + sprintf(optstr,"%s-%d",indent,option->short_name); + + else if (flong && option->long_name) + sprintf(optstr,"%s%s%s", + indent,prefix,option->long_name); + + else if (fboth && option->long_name) + sprintf(optstr,"%s %s%s", + indent,prefix,option->long_name); + + else + optstr[0] = 0; + + /* right-indented option buffer */ + if (description[0]) { + len = strlen(optstr); + sprintf(&optstr[len],"%-*c",(int)(optlen-len),' '); + } + + /* single line? */ + if (optlen + strlen(description) < width) { + fprintf(stdout,"%s%s\n",optstr,description); + + } else { + desc = description; + cap = desc + strlen(description); + + while (desc < cap) { + mark = (desc + desclen >= cap) + ? cap : desc + desclen; + + while (*mark && (mark > desc) + && (*mark != ' ') + && (*mark != '\t') + && (*mark != '\n')) + mark--; + + if (mark == desc) { + mark = (desc + desclen >= cap) + ? cap : desc + desclen; + cache = *mark; + *mark = 0; + } else { + cache = 0; + *mark = 0; + } + + /* first line? */ + if (desc == description) + fprintf(stdout,"%s%s\n",optstr,desc); + else + fprintf(stdout,"%-*c %s\n",(int)optlen,' ',desc); + + if (cache) + *mark = cache; + else + mark++; + + desc = mark; + } + } + } } #endif |