From e9098c5591f439cdf8a923c9298b8fc7ff28a3ac Mon Sep 17 00:00:00 2001
From: midipix <writeonce@midipix.org>
Date: Sun, 28 Apr 2024 18:21:32 +0000
Subject: imported argv.h: a thread-safe argument vector parser.
---
src/internal/argv/argv.h | 1022 ++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 1022 insertions(+)
create mode 100644 src/internal/argv/argv.h
diff --git a/src/internal/argv/argv.h b/src/internal/argv/argv.h
new file mode 100644
index 0000000..90e65ea
--- /dev/null
+++ b/src/internal/argv/argv.h
@@ -0,0 +1,1022 @@
+/****************************************************************************/
+/* argv.h: a thread-safe argument vector parser and usage screen generator */
+/* Copyright (C) 2015--2024 SysDeer Technologies, LLC */
+/* Released under GPLv2 and GPLv3; see COPYING.TREEBNF. */
+/****************************************************************************/
+
+#ifndef ARGV_H
+#define ARGV_H
+
+#include <stdbool.h>
+#include <stdint.h>
+#include <stddef.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+
+#define ARGV_VERBOSITY_NONE 0x00
+#define ARGV_VERBOSITY_ERRORS 0x01
+#define ARGV_VERBOSITY_STATUS 0x02
+#define ARGV_CLONE_VECTOR 0x80
+
+#ifndef ARGV_TAB_WIDTH
+#define ARGV_TAB_WIDTH 8
+#endif
+
+/*******************************************/
+/* */
+/* support of hybrid options */
+/* ------------------------- */
+/* hybrid options are very similar to */
+/* long options, yet are prefixed by */
+/* a single dash rather than two */
+/* (i.e. -std, -isystem). */
+/* hybrid options are supported by this */
+/* driver for compatibility with legacy */
+/* tools; note, however, that the use */
+/* of hybrid options should be strongly */
+/* discouraged due to the limitations */
+/* they impose on short options (for */
+/* example, a driver implementing -std */
+/* may not provide -s as a short option */
+/* that takes an arbitrary value). */
+/* */
+/* SPACE: -hybrid VALUE (i.e. -MF file) */
+/* EQUAL: -hybrid=VALUE (i.e. -std=c99) */
+/* COMMA: -hybrid,VALUE (i.e. -Wl,<arg>) */
+/* ONLY: -opt accepted, --opt rejected */
+/* JOINED: -optVALUE */
+/* */
+/*******************************************/
+
+
+#define ARGV_OPTION_HYBRID_NONE 0x00
+#define ARGV_OPTION_HYBRID_ONLY 0x01
+#define ARGV_OPTION_HYBRID_SPACE 0x02
+#define ARGV_OPTION_HYBRID_EQUAL 0x04
+#define ARGV_OPTION_HYBRID_COMMA 0x08
+#define ARGV_OPTION_HYBRID_JOINED 0x10
+#define ARGV_OPTION_HYBRID_CIRCUS (ARGV_OPTION_HYBRID_SPACE \
+ | ARGV_OPTION_HYBRID_JOINED)
+#define ARGV_OPTION_HYBRID_DUAL (ARGV_OPTION_HYBRID_SPACE \
+ | ARGV_OPTION_HYBRID_EQUAL)
+#define ARGV_OPTION_HYBRID_SWITCH (ARGV_OPTION_HYBRID_ONLY \
+ | ARGV_OPTION_HYBRID_SPACE \
+ | ARGV_OPTION_HYBRID_EQUAL \
+ | ARGV_OPTION_HYBRID_COMMA \
+ | ARGV_OPTION_HYBRID_JOINED)
+
+enum argv_optarg {
+ ARGV_OPTARG_NONE,
+ ARGV_OPTARG_REQUIRED,
+ ARGV_OPTARG_OPTIONAL,
+};
+
+enum argv_mode {
+ ARGV_MODE_SCAN,
+ ARGV_MODE_COPY,
+};
+
+enum argv_error {
+ ARGV_ERROR_OK,
+ ARGV_ERROR_INTERNAL,
+ ARGV_ERROR_SHORT_OPTION,
+ ARGV_ERROR_LONG_OPTION,
+ ARGV_ERROR_VENDOR_OPTION,
+ ARGV_ERROR_OPTARG_NONE,
+ ARGV_ERROR_OPTARG_REQUIRED,
+ ARGV_ERROR_OPTARG_PARADIGM,
+ ARGV_ERROR_HYBRID_NONE,
+ ARGV_ERROR_HYBRID_ONLY,
+ ARGV_ERROR_HYBRID_SPACE,
+ ARGV_ERROR_HYBRID_EQUAL,
+ ARGV_ERROR_HYBRID_COMMA,
+};
+
+struct argv_option {
+ const char * long_name;
+ const char short_name;
+ int tag;
+ enum argv_optarg optarg;
+ int flags;
+ const char * paradigm;
+ const char * argname;
+ const char * description;
+};
+
+struct argv_entry {
+ const char * arg;
+ int tag;
+ bool fopt;
+ bool fval;
+ bool fnoscan;
+ enum argv_error errcode;
+};
+
+struct argv_meta {
+ char ** argv;
+ struct argv_entry * entries;
+};
+
+struct argv_ctx {
+ int flags;
+ int mode;
+ int nentries;
+ intptr_t unitidx;
+ intptr_t erridx;
+ enum argv_error errcode;
+ const char * errch;
+ const struct argv_option * erropt;
+ const char * program;
+};
+
+#ifdef ARGV_DRIVER
+
+struct argv_meta_impl {
+ char ** argv;
+ char * strbuf;
+ struct argv_meta meta;
+};
+
+static int argv_optv_init(
+ const struct argv_option[],
+ const struct argv_option **);
+
+static const char * argv_program_name(const char *);
+
+static void argv_usage(
+ int fd,
+ const char * header,
+ const struct argv_option **,
+ const char * mode);
+
+static void argv_usage_plain(
+ int fd,
+ const char * header,
+ const struct argv_option **,
+ const char * mode);
+
+static struct argv_meta * argv_get(
+ char **,
+ const struct argv_option **,
+ int flags,
+ int fd);
+
+static void argv_free(struct argv_meta *);
+
+#ifndef argv_dprintf
+#define argv_dprintf dprintf
+#endif
+
+
+
+/*------------------------------------*/
+/* implementation of static functions */
+/*------------------------------------*/
+
+static int argv_optv_init(
+ const struct argv_option options[],
+ const struct argv_option ** optv)
+{
+ const struct argv_option * option;
+ int i;
+
+ for (option=options,i=0; option->long_name || option->short_name; option++)
+ optv[i++] = option;
+
+ optv[i] = 0;
+ return i;
+}
+
+static const struct argv_option * argv_short_option(
+ const char * ch,
+ const struct argv_option ** optv,
+ struct argv_entry * entry)
+{
+ const struct argv_option * option;
+
+ for (; *optv; optv++) {
+ option = *optv;
+
+ if (option->short_name == *ch) {
+ entry->tag = option->tag;
+ entry->fopt = true;
+ return option;
+ }
+ }
+
+ return 0;
+}
+
+static const struct argv_option * argv_long_option(
+ const char * ch,
+ const struct argv_option ** optv,
+ struct argv_entry * entry)
+{
+ const struct argv_option * option;
+ const char * arg;
+ size_t len;
+
+ for (; *optv; optv++) {
+ option = *optv;
+ len = option->long_name ? strlen(option->long_name) : 0;
+
+ if (len && !(strncmp(option->long_name,ch,len))) {
+ arg = ch + len;
+
+ if (!*arg
+ || (*arg == '=')
+ || (option->flags & ARGV_OPTION_HYBRID_JOINED)
+ || ((option->flags & ARGV_OPTION_HYBRID_COMMA)
+ && (*arg == ','))) {
+ entry->tag = option->tag;
+ entry->fopt = true;
+ return option;
+ }
+ }
+ }
+
+ return 0;
+}
+
+static inline bool is_short_option(const char * arg)
+{
+ return (arg[0]=='-') && arg[1] && (arg[1]!='-');
+}
+
+static inline bool is_long_option(const char * arg)
+{
+ return (arg[0]=='-') && (arg[1]=='-') && arg[2];
+}
+
+static inline bool is_last_option(const char * arg)
+{
+ return (arg[0]=='-') && (arg[1]=='-') && !arg[2];
+}
+
+static inline bool is_hybrid_option(
+ const char * arg,
+ const struct argv_option ** optv)
+{
+ const struct argv_option * option;
+ struct argv_entry entry;
+
+ if (!is_short_option(arg))
+ return false;
+
+ if (!(option = argv_long_option(++arg,optv,&entry)))
+ return false;
+
+ if (!(option->flags & ARGV_OPTION_HYBRID_SWITCH))
+ if (argv_short_option(arg,optv,&entry))
+ return false;
+
+ return true;
+}
+
+static inline bool is_arg_in_paradigm(const char * arg, const char * paradigm)
+{
+ size_t len;
+ const char * ch;
+
+ for (ch=paradigm,len=strlen(arg); ch; ) {
+ if (!strncmp(arg,ch,len)) {
+ if (!*(ch += len))
+ return true;
+ else if (*ch == '|')
+ return true;
+ }
+
+ if ((ch = strchr(ch,'|')))
+ ch++;
+ }
+
+ return false;
+}
+
+static inline const struct argv_option * option_from_tag(
+ const struct argv_option ** optv,
+ int tag)
+{
+ for (; *optv; optv++)
+ if (optv[0]->tag == tag)
+ return optv[0];
+ return 0;
+}
+
+static void argv_scan(
+ char ** argv,
+ const struct argv_option ** optv,
+ struct argv_ctx * ctx,
+ struct argv_meta * meta)
+{
+ char ** parg;
+ const char * ch;
+ const char * val;
+ const struct argv_option * option;
+ struct argv_entry entry;
+ struct argv_entry * mentry;
+ enum argv_error ferr;
+ bool fval;
+ bool fnext;
+ bool fshort;
+ bool fhybrid;
+ bool fnoscan;
+
+ parg = &argv[1];
+ ch = *parg;
+ ferr = ARGV_ERROR_OK;
+ fshort = false;
+ fnoscan = false;
+ fval = false;
+ mentry = meta ? meta->entries : 0;
+
+ ctx->unitidx = 0;
+ ctx->erridx = 0;
+
+ while (ch && (ferr == ARGV_ERROR_OK)) {
+ option = 0;
+ fhybrid = false;
+
+ if (fnoscan)
+ fval = true;
+
+ else if (is_last_option(ch))
+ fnoscan = true;
+
+ else if (!fshort && is_hybrid_option(ch,optv))
+ fhybrid = true;
+
+ if (!fnoscan && !fhybrid && (fshort || is_short_option(ch))) {
+ if (!fshort)
+ ch++;
+
+ if ((option = argv_short_option(ch,optv,&entry))) {
+ if (ch[1]) {
+ ch++;
+ fnext = false;
+ fshort = (option->optarg == ARGV_OPTARG_NONE);
+ } else {
+ parg++;
+ ch = *parg;
+ fnext = true;
+ fshort = false;
+ }
+
+ if (option->optarg == ARGV_OPTARG_NONE) {
+ if (!fnext && ch && (*ch == '-')) {
+ ferr = ARGV_ERROR_OPTARG_NONE;
+ } else {
+ fval = false;
+ }
+
+ } else if (!fnext) {
+ fval = true;
+
+ } else if (option->optarg == ARGV_OPTARG_REQUIRED) {
+ if (ch && is_short_option(ch))
+ ferr = ARGV_ERROR_OPTARG_REQUIRED;
+ else if (ch && is_long_option(ch))
+ ferr = ARGV_ERROR_OPTARG_REQUIRED;
+ else if (ch && is_last_option(ch))
+ ferr = ARGV_ERROR_OPTARG_REQUIRED;
+ else if (ch)
+ fval = true;
+ else
+ ferr = ARGV_ERROR_OPTARG_REQUIRED;
+ } else {
+ /* ARGV_OPTARG_OPTIONAL */
+ if (ch && is_short_option(ch))
+ fval = false;
+ else if (ch && is_long_option(ch))
+ fval = false;
+ else if (ch && is_last_option(ch))
+ fval = false;
+ else if (fnext)
+ fval = false;
+ else
+ fval = ch;
+ }
+ } else {
+ if ((ch == &parg[0][1]) && (ch[0] == 'W') && ch[1]) {
+ ferr = ARGV_ERROR_VENDOR_OPTION;
+ } else {
+ ferr = ARGV_ERROR_SHORT_OPTION;
+ }
+ }
+
+ } else if (!fnoscan && (fhybrid || is_long_option(ch))) {
+ ch += (fhybrid ? 1 : 2);
+
+ if ((option = argv_long_option(ch,optv,&entry))) {
+ val = ch + strlen(option->long_name);
+
+ /* val[0] is either '=' (or ',') or '\0' */
+ if (!val[0]) {
+ parg++;
+ ch = *parg;
+ }
+
+ /* now verify the proper setting of option values */
+ if (fhybrid && !(option->flags & ARGV_OPTION_HYBRID_SWITCH)) {
+ ferr = ARGV_ERROR_HYBRID_NONE;
+
+ } else if (!fhybrid && (option->flags & ARGV_OPTION_HYBRID_ONLY)) {
+ ferr = ARGV_ERROR_HYBRID_ONLY;
+
+ } else if (option->optarg == ARGV_OPTARG_NONE) {
+ if (val[0]) {
+ ferr = ARGV_ERROR_OPTARG_NONE;
+ ctx->errch = val + 1;
+ } else {
+ fval = false;
+ }
+
+ } else if (val[0] && (option->flags & ARGV_OPTION_HYBRID_JOINED)) {
+ fval = true;
+ ch = val;
+
+ } else if (fhybrid && !val[0] && !(option->flags & ARGV_OPTION_HYBRID_SPACE)) {
+ if (option->optarg == ARGV_OPTARG_OPTIONAL) {
+ fval = false;
+
+ } else {
+ ferr = ARGV_ERROR_HYBRID_SPACE;
+ }
+
+ } else if (fhybrid && (val[0]=='=') && !(option->flags & ARGV_OPTION_HYBRID_EQUAL)) {
+ ferr = ARGV_ERROR_HYBRID_EQUAL;
+
+ } else if (fhybrid && (val[0]==',') && !(option->flags & ARGV_OPTION_HYBRID_COMMA)) {
+ ferr = ARGV_ERROR_HYBRID_COMMA;
+
+ } else if (!fhybrid && (val[0]==',')) {
+ ferr = ARGV_ERROR_HYBRID_COMMA;
+
+ } else if (val[0] && !val[1]) {
+ ferr = ARGV_ERROR_OPTARG_REQUIRED;
+
+ } else if (val[0] && val[1]) {
+ fval = true;
+ ch = ++val;
+
+ } else if (option->optarg == ARGV_OPTARG_REQUIRED) {
+ if (!val[0] && !*parg) {
+ ferr = ARGV_ERROR_OPTARG_REQUIRED;
+
+ } else if (*parg && is_short_option(*parg)) {
+ ferr = ARGV_ERROR_OPTARG_REQUIRED;
+
+ } else if (*parg && is_long_option(*parg)) {
+ ferr = ARGV_ERROR_OPTARG_REQUIRED;
+
+ } else if (*parg && is_last_option(*parg)) {
+ ferr = ARGV_ERROR_OPTARG_REQUIRED;
+
+ } else {
+ fval = true;
+ }
+ } else {
+ /* ARGV_OPTARG_OPTIONAL */
+ fval = val[0];
+ }
+ } else {
+ ferr = ARGV_ERROR_LONG_OPTION;
+ }
+ }
+
+ if (ferr == ARGV_ERROR_OK)
+ if (option && fval && option->paradigm)
+ if (!is_arg_in_paradigm(ch,option->paradigm))
+ ferr = ARGV_ERROR_OPTARG_PARADIGM;
+
+ if (ferr == ARGV_ERROR_OK)
+ if (!option && !ctx->unitidx)
+ ctx->unitidx = parg - argv;
+
+ if (ferr != ARGV_ERROR_OK) {
+ ctx->errcode = ferr;
+ ctx->errch = ctx->errch ? ctx->errch : ch;
+ ctx->erropt = option;
+ ctx->erridx = parg - argv;
+ return;
+ } else if (ctx->mode == ARGV_MODE_SCAN) {
+ if (!fnoscan)
+ ctx->nentries++;
+ else if (fval)
+ ctx->nentries++;
+
+ if (fval || !option) {
+ parg++;
+ ch = *parg;
+ }
+ } else if (ctx->mode == ARGV_MODE_COPY) {
+ if (fnoscan) {
+ if (fval) {
+ mentry->arg = ch;
+ mentry->fnoscan = true;
+ mentry++;
+ }
+
+ parg++;
+ ch = *parg;
+ } else if (option) {
+ mentry->arg = fval ? ch : 0;
+ mentry->tag = option->tag;
+ mentry->fopt = true;
+ mentry->fval = fval;
+ mentry++;
+
+ if (fval) {
+ parg++;
+ ch = *parg;
+ }
+ } else {
+ mentry->arg = ch;
+ mentry++;
+ parg++;
+ ch = *parg;
+ }
+ }
+ }
+}
+
+static const char * argv_program_name(const char * program_path)
+{
+ const char * ch;
+
+ if (program_path) {
+ if ((ch = strrchr(program_path,'/')))
+ return *(++ch) ? ch : 0;
+
+ if ((ch = strrchr(program_path,'\\')))
+ return *(++ch) ? ch : 0;
+ }
+
+ return program_path;
+}
+
+static void argv_show_error(int fd, struct argv_ctx * ctx)
+{
+ const char * src;
+ char * dst;
+ char * cap;
+ char opt_vendor_buf[256];
+ char opt_short_name[2] = {0,0};
+
+ if (ctx->erropt && ctx->erropt->short_name)
+ opt_short_name[0] = ctx->erropt->short_name;
+
+ argv_dprintf(fd,"%s: error: ",ctx->program);
+
+ switch (ctx->errcode) {
+ case ARGV_ERROR_SHORT_OPTION:
+ argv_dprintf(fd,"'-%c' is not a valid short option\n",*ctx->errch);
+ break;
+
+ case ARGV_ERROR_LONG_OPTION:
+ argv_dprintf(fd,"'--%s' is not a valid long option\n",ctx->errch);
+ break;
+
+ case ARGV_ERROR_VENDOR_OPTION:
+ src = ctx->errch;
+ dst = opt_vendor_buf;
+ cap = &opt_vendor_buf[sizeof(opt_vendor_buf)];
+
+ for (; src && *src && dst<cap; ) {
+ if ((*src == '=') || (*src == ',') || (*src == ':')) {
+ src = 0;
+ } else {
+ *dst++ = *src++;
+ }
+ }
+
+ if (dst == cap)
+ dst--;
+
+ *dst = '\0';
+
+ argv_dprintf(fd,"'-%s' is not a valid vendor option\n",opt_vendor_buf);
+ break;
+
+ case ARGV_ERROR_OPTARG_NONE:
+ argv_dprintf(fd,"'%s' is not a valid option value for [%s%s%s%s%s] "
+ "(option values may not be specified)\n",
+ ctx->errch,
+ opt_short_name[0] ? "-" : "",
+ opt_short_name,
+ opt_short_name[0] ? "," : "",
+ ctx->erropt->long_name ? "--" : "",
+ ctx->erropt->long_name);
+ break;
+
+ case ARGV_ERROR_OPTARG_REQUIRED:
+ argv_dprintf(fd,"option [%s%s%s%s%s] requires %s %s%s%s\n",
+ opt_short_name[0] ? "-" : "",
+ opt_short_name,
+ opt_short_name[0] ? "," : "",
+ ctx->erropt->long_name
+ ? (ctx->erropt->flags & ARGV_OPTION_HYBRID_ONLY) ? "-" : "--"
+ : "",
+ ctx->erropt->long_name,
+ ctx->erropt->paradigm ? "one of the following values:" : "a value",
+ ctx->erropt->paradigm ? "{" : "",
+ ctx->erropt->paradigm ? ctx->erropt->paradigm : "",
+ ctx->erropt->paradigm ? "}" : "");
+ break;
+
+ case ARGV_ERROR_OPTARG_PARADIGM:
+ argv_dprintf(fd,"'%s' is not a valid option value for [%s%s%s%s%s]={%s}\n",
+ ctx->errch,
+ opt_short_name[0] ? "-" : "",
+ opt_short_name,
+ opt_short_name[0] ? "," : "",
+ ctx->erropt->long_name ? "--" : "",
+ ctx->erropt->long_name,
+ ctx->erropt->paradigm);
+ break;
+
+ case ARGV_ERROR_HYBRID_NONE:
+ argv_dprintf(fd,"-%s is not a synonym for --%s\n",
+ ctx->erropt->long_name,
+ ctx->erropt->long_name);
+ break;
+
+ case ARGV_ERROR_HYBRID_ONLY:
+ argv_dprintf(fd,"--%s is not a synonym for -%s\n",
+ ctx->erropt->long_name,
+ ctx->erropt->long_name);
+ break;
+
+ case ARGV_ERROR_HYBRID_SPACE:
+ case ARGV_ERROR_HYBRID_EQUAL:
+ case ARGV_ERROR_HYBRID_COMMA:
+ argv_dprintf(fd,"-%s: illegal value assignment; valid syntax is "
+ "-%s%sVAL\n",
+ ctx->erropt->long_name,
+ ctx->erropt->long_name,
+ (ctx->erropt->flags & ARGV_OPTION_HYBRID_SPACE)
+ ? " " : (ctx->erropt->flags & ARGV_OPTION_HYBRID_EQUAL)
+ ? "=" : (ctx->erropt->flags & ARGV_OPTION_HYBRID_COMMA)
+ ? "," : "");
+
+ break;
+
+ case ARGV_ERROR_INTERNAL:
+ argv_dprintf(fd,"internal error");
+ break;
+
+ default:
+ break;
+ }
+}
+
+static void argv_show_status(
+ int fd,
+ const struct argv_option ** optv,
+ struct argv_ctx * ctx,
+ struct argv_meta * meta)
+{
+ int argc;
+ char ** argv;
+ struct argv_entry * entry;
+ const struct argv_option * option;
+ char short_name[2] = {0};
+ const char * space = "";
+
+ (void)ctx;
+
+ argv_dprintf(fd,"\n\nconcatenated command line:\n");
+ for (argv=meta->argv; *argv; argv++) {
+ argv_dprintf(fd,"%s%s",space,*argv);
+ space = " ";
+ }
+
+ argv_dprintf(fd,"\n\nargument vector:\n");
+ for (argc=0,argv=meta->argv; *argv; argc++,argv++)
+ argv_dprintf(fd,"argv[%d]: %s\n",argc,*argv);
+
+ argv_dprintf(fd,"\n\nparsed entries:\n");
+ for (entry=meta->entries; entry->arg || entry->fopt; entry++)
+ if (entry->fopt) {
+ option = option_from_tag(optv,entry->tag);
+ short_name[0] = option->short_name;
+
+ if (entry->fval)
+ argv_dprintf(fd,"[-%s,--%s] := %s\n",
+ short_name,option->long_name,entry->arg);
+ else
+ argv_dprintf(fd,"[-%s,--%s]\n",
+ short_name,option->long_name);
+ } else
+ argv_dprintf(fd,"<program arg> := %s\n",entry->arg);
+
+ argv_dprintf(fd,"\n\n");
+}
+
+static struct argv_meta * argv_free_impl(struct argv_meta_impl * imeta)
+{
+ if (imeta->argv)
+ free(imeta->argv);
+
+ if (imeta->strbuf)
+ free(imeta->strbuf);
+
+ if (imeta->meta.entries)
+ free(imeta->meta.entries);
+
+ free(imeta);
+ return 0;
+}
+
+static struct argv_meta * argv_alloc(char ** argv, struct argv_ctx * ctx)
+{
+ struct argv_meta_impl * imeta;
+ char ** vector;
+ char * dst;
+ size_t size;
+ int argc;
+ int i;
+
+ if (!(imeta = calloc(1,sizeof(*imeta))))
+ return 0;
+
+ if (ctx->flags & ARGV_CLONE_VECTOR) {
+ for (vector=argv,argc=0,size=0; *vector; vector++) {
+ size += strlen(*vector) + 1;
+ argc++;
+ }
+
+ if (!(imeta->argv = calloc(argc+1,sizeof(char *))))
+ return argv_free_impl(imeta);
+ else if (!(imeta->strbuf = calloc(1,size+1)))
+ return argv_free_impl(imeta);
+
+ for (i=0,dst=imeta->strbuf; i<argc; i++) {
+ strcpy(dst,argv[i]);
+ imeta->argv[i] = dst;
+ dst += strlen(dst)+1;
+ }
+
+ imeta->meta.argv = imeta->argv;
+ } else
+ imeta->meta.argv = argv;
+
+ if (!(imeta->meta.entries = calloc(
+ ctx->nentries+1,
+ sizeof(struct argv_entry))))
+ return argv_free_impl(imeta);
+ else
+ return &imeta->meta;
+}
+
+static struct argv_meta * argv_get(
+ char ** argv,
+ const struct argv_option ** optv,
+ int flags,
+ int fd)
+{
+ struct argv_meta * meta;
+ struct argv_ctx ctx = {flags,ARGV_MODE_SCAN,0,0,0,0,0,0,0};
+
+ argv_scan(argv,optv,&ctx,0);
+
+ if (ctx.errcode != ARGV_ERROR_OK) {
+ ctx.program = argv_program_name(argv[0]);
+
+ if (ctx.flags & ARGV_VERBOSITY_ERRORS)
+ argv_show_error(fd,&ctx);
+
+ return 0;
+ }
+
+ if (!(meta = argv_alloc(argv,&ctx)))
+ return 0;
+
+ ctx.mode = ARGV_MODE_COPY;
+ argv_scan(meta->argv,optv,&ctx,meta);
+
+ if (ctx.errcode != ARGV_ERROR_OK) {
+ ctx.program = argv[0];
+ ctx.errcode = ARGV_ERROR_INTERNAL;
+ argv_show_error(fd,&ctx);
+ argv_free(meta);
+
+ return 0;
+ }
+
+ if (ctx.flags & ARGV_VERBOSITY_STATUS)
+ argv_show_status(fd,optv,&ctx,meta);
+
+ return meta;
+}
+
+static void argv_free(struct argv_meta * xmeta)
+{
+ struct argv_meta_impl * imeta;
+ uintptr_t addr;
+
+ if (xmeta) {
+ addr = (uintptr_t)xmeta - offsetof(struct argv_meta_impl,meta);
+ imeta = (struct argv_meta_impl *)addr;
+ argv_free_impl(imeta);
+ }
+}
+
+static void argv_usage_impl(
+ int fd,
+ const char * header,
+ const struct argv_option ** options,
+ const char * mode,
+ int fcolor)
+{
+ const struct argv_option ** optv;
+ 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[] = " ";
+ const char creset[] = "\x1b[0m";
+ const char cbold [] = "\x1b[1m";
+ const char cgreen[] = "\x1b[32m";
+ const char cblue [] = "\x1b[34m";
+ const char ccyan [] = "\x1b[36m";
+ const char * color = ccyan;
+
+ (void)argv_usage;
+ (void)argv_usage_plain;
+
+ fshort = mode ? !strcmp(mode,"short") : 0;
+ flong = fshort ? 0 : mode && !strcmp(mode,"long");
+ fboth = !fshort && !flong;
+
+ if (fcolor)
+ argv_dprintf(fd,"%s%s",cbold,cgreen);
+
+ if (header)
+ argv_dprintf(fd,"%s",header);
+
+ for (optlen=0,optv=options; *optv; optv++) {
+ option = *optv;
+
+ /* 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) {
+ argv_dprintf(fd,
+ "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 (optv=options; *optv; optv++) {
+ option = *optv;
+
+ /* color */
+ if (fcolor) {
+ color = (color == ccyan) ? cblue : ccyan;
+ argv_dprintf(fd,color);
+ }
+
+ /* 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-%c",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) {
+ argv_dprintf(fd,"%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 != '|')
+ && (*mark != '\t')
+ && (*mark != '\n'))
+ mark--;
+
+ if (mark == desc) {
+ mark = (desc + desclen >= cap)
+ ? cap : desc + desclen;
+ cache = *mark;
+ *mark = 0;
+ } else if (*mark == '|') {
+ cache = *mark;
+ *mark = 0;
+ } else {
+ cache = 0;
+ *mark = 0;
+ }
+
+ /* first line? */
+ if (desc == description)
+ argv_dprintf(fd,"%s%s\n",optstr,desc);
+ else
+ argv_dprintf(fd,"%-*c %s\n",
+ (*desc == '|')
+ ? (int)(optlen+1)
+ : (int)optlen,
+ ' ',desc);
+
+ if (cache)
+ *mark = cache;
+ else
+ mark++;
+
+ desc = mark;
+ }
+ }
+ }
+
+ if (fcolor)
+ argv_dprintf(fd,creset);
+}
+
+static void argv_usage(
+ int fd,
+ const char * header,
+ const struct argv_option ** options,
+ const char * mode)
+{
+ argv_usage_impl(fd,header,options,mode,isatty(fd));
+}
+
+static void argv_usage_plain(
+ int fd,
+ const char * header,
+ const struct argv_option ** options,
+ const char * mode)
+{
+ argv_usage_impl(fd,header,options,mode,0);
+}
+
+#endif
+
+#endif
--
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