mirror of git://projects.qi-hardware.com/fped.git
115 lines
1.9 KiB
C
115 lines
1.9 KiB
C
/*
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* util.c - Common utility functions
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*
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* Written 2009 by Werner Almesberger
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* Copyright 2009 by Werner Almesberger
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <stdarg.h>
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#include <stdio.h>
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#include <string.h>
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#include "util.h"
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/* ----- printf buffer allocation ------------------------------------------ */
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char *stralloc_vprintf(const char *fmt, va_list ap)
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{
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va_list aq;
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char *buf;
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int n;
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va_copy(aq, ap);
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n = vsnprintf(NULL, 0, fmt, aq);
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va_end(aq);
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buf = alloc_size(n+1);
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vsnprintf(buf, n+1, fmt, ap);
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return buf;
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}
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char *stralloc_printf(const char *fmt, ...)
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{
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va_list ap;
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char *s;
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va_start(ap, fmt);
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s = stralloc_vprintf(fmt, ap);
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va_end(ap);
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return s;
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}
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/* ----- identifier syntax check ------------------------------------------- */
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int is_id_char(char c, int first)
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{
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if ((c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z') || c == '_')
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return 1;
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if (first)
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return 0;
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return c >= '0' && c <= '9';
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}
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int is_id(const char *s)
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{
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const char *p;
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if (!*s)
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return 0;
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for (p = s; *p; p++)
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if (!is_id_char(*p, s == p))
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return 0;
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return 1;
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}
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/* ----- unique identifiers ------------------------------------------------ */
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static struct unique {
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char *s;
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struct unique *next;
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} *uniques = NULL;
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/* @@@ consider using rb trees */
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const char *unique(const char *s)
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{
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struct unique **walk;
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for (walk = &uniques; *walk; walk = &(*walk)->next)
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if (!strcmp(s, (*walk)->s))
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return (*walk)->s;
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*walk = alloc_type(struct unique);
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(*walk)->s = stralloc(s);
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(*walk)->next = NULL;
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return (*walk)->s;
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}
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void unique_cleanup(void)
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{
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struct unique *next;
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while (uniques) {
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next = uniques->next;
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free(uniques->s);
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free(uniques);
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uniques = next;
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}
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}
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