thodg/cgminer/ccan/opt/usage.c

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• Hash : a0d14d15
  Author :
  Date : 2011-07-06T16:47:25
  

  ccan: add ccan/opt and dependencies to build.

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• ccan/opt/usage.c

• #include <ccan/opt/opt.h>
  #include <string.h>
  #include <stdlib.h>
  #include <stdio.h>
  #include <stdint.h>
  #include "private.h"
  
  /* We only use this for pointer comparisons. */
  const char opt_hidden[1];
  
  static unsigned write_short_options(char *str)
  {
  	unsigned int i, num = 0;
  	const char *p;
  
  	for (p = first_sopt(&i); p; p = next_sopt(p, &i)) {
  		if (opt_table[i].desc != opt_hidden)
  			str[num++] = *p;
  	}
  	return num;
  }
  
  #define OPT_SPACE_PAD "                    "
  
  /* FIXME: Get all purdy. */
  char *opt_usage(const char *argv0, const char *extra)
  {
  	unsigned int i, num, len;
  	char *ret, *p;
  
  	if (!extra) {
  		extra = "";
  		for (i = 0; i < opt_count; i++) {
  			if (opt_table[i].cb == (void *)opt_usage_and_exit
  			    && opt_table[i].u.carg) {
  				extra = opt_table[i].u.carg;
  				break;
  			}
  		}
  	}
  
  	/* An overestimate of our length. */
  	len = strlen("Usage: %s ") + strlen(argv0)
  		+ strlen("[-%.*s]") + opt_num_short + 1
  		+ strlen(" ") + strlen(extra)
  		+ strlen("\n");
  
  	for (i = 0; i < opt_count; i++) {
  		if (opt_table[i].type == OPT_SUBTABLE) {
  			len += strlen("\n") + strlen(opt_table[i].desc)
  				+ strlen(":\n");
  		} else if (opt_table[i].desc != opt_hidden) {
  			len += strlen(opt_table[i].names) + strlen(" <arg>");
  			len += strlen(OPT_SPACE_PAD)
  				+ strlen(opt_table[i].desc) + 1;
  			if (opt_table[i].show) {
  				len += strlen("(default: %s)")
  					+ OPT_SHOW_LEN + sizeof("...");
  			}
  			len += strlen("\n");
  		}
  	}
  
  	p = ret = malloc(len);
  	if (!ret)
  		return NULL;
  
  	p += sprintf(p, "Usage: %s", argv0);
  	p += sprintf(p, " [-");
  	num = write_short_options(p);
  	if (num) {
  		p += num;
  		p += sprintf(p, "]");
  	} else {
  		/* Remove start of single-entry options */
  		p -= 3;
  	}
  	if (extra)
  		p += sprintf(p, " %s", extra);
  	p += sprintf(p, "\n");
  
  	for (i = 0; i < opt_count; i++) {
  		if (opt_table[i].desc == opt_hidden)
  			continue;
  		if (opt_table[i].type == OPT_SUBTABLE) {
  			p += sprintf(p, "%s:\n", opt_table[i].desc);
  			continue;
  		}
  		len = sprintf(p, "%s", opt_table[i].names);
  		if (opt_table[i].type == OPT_HASARG
  		    && !strchr(opt_table[i].names, ' ')
  		    && !strchr(opt_table[i].names, '='))
  			len += sprintf(p + len, " <arg>");
  		len += sprintf(p + len, "%.*s",
  			       len < strlen(OPT_SPACE_PAD)
  			       ? (unsigned)strlen(OPT_SPACE_PAD) - len : 1,
  			       OPT_SPACE_PAD);
  
  		len += sprintf(p + len, "%s", opt_table[i].desc);
  		if (opt_table[i].show) {
  			char buf[OPT_SHOW_LEN + sizeof("...")];
  			strcpy(buf + OPT_SHOW_LEN, "...");
  			opt_table[i].show(buf, opt_table[i].u.arg);
  			len += sprintf(p + len, " (default: %s)", buf);
  		}
  		p += len;
  		p += sprintf(p, "\n");
  	}
  	*p = '\0';
  	return ret;
  }
  

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