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| 1 | /* |
| 2 | * util.c - Common utility functions |
| 3 | * |
| 4 | * Written 2009 by Werner Almesberger |
| 5 | * Copyright 2009 by Werner Almesberger |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; either version 2 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | */ |
| 12 | |
| 13 | |
| 14 | #include <stdarg.h> |
| 15 | #include <stdio.h> |
| 16 | #include <string.h> |
| 17 | |
| 18 | #include "util.h" |
| 19 | |
| 20 | |
| 21 | |
| 22 | /* ----- printf buffer allocation ------------------------------------------ */ |
| 23 | |
| 24 | |
| 25 | char *stralloc_vprintf(const char *fmt, va_list ap) |
| 26 | { |
| 27 | va_list aq; |
| 28 | char *buf; |
| 29 | int n; |
| 30 | |
| 31 | va_copy(aq, ap); |
| 32 | n = vsnprintf(NULL, 0, fmt, aq); |
| 33 | va_end(aq); |
| 34 | buf = alloc_size(n+1); |
| 35 | vsnprintf(buf, n+1, fmt, ap); |
| 36 | return buf; |
| 37 | } |
| 38 | |
| 39 | |
| 40 | char *stralloc_printf(const char *fmt, ...) |
| 41 | { |
| 42 | va_list ap; |
| 43 | char *s; |
| 44 | |
| 45 | va_start(ap, fmt); |
| 46 | s = stralloc_vprintf(fmt, ap); |
| 47 | va_end(ap); |
| 48 | return s; |
| 49 | } |
| 50 | |
| 51 | |
| 52 | /* ----- identifier syntax check ------------------------------------------- */ |
| 53 | |
| 54 | |
| 55 | int is_id_char(char c, int first) |
| 56 | { |
| 57 | if ((c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z') || c == '_') |
| 58 | return 1; |
| 59 | if (first) |
| 60 | return 0; |
| 61 | return c >= '0' && c <= '9'; |
| 62 | } |
| 63 | |
| 64 | |
| 65 | int is_id(const char *s) |
| 66 | { |
| 67 | const char *p; |
| 68 | |
| 69 | if (!*s) |
| 70 | return 0; |
| 71 | for (p = s; *p; p++) |
| 72 | if (!is_id_char(*p, s == p)) |
| 73 | return 0; |
| 74 | return 1; |
| 75 | } |
| 76 | |
| 77 | |
| 78 | /* ----- unique identifiers ------------------------------------------------ */ |
| 79 | |
| 80 | |
| 81 | static struct unique { |
| 82 | char *s; |
| 83 | struct unique *next; |
| 84 | } *uniques = NULL; |
| 85 | |
| 86 | |
| 87 | /* @@@ consider using rb trees */ |
| 88 | |
| 89 | const char *unique(const char *s) |
| 90 | { |
| 91 | struct unique **walk; |
| 92 | |
| 93 | for (walk = &uniques; *walk; walk = &(*walk)->next) |
| 94 | if (!strcmp(s, (*walk)->s)) |
| 95 | return (*walk)->s; |
| 96 | *walk = alloc_type(struct unique); |
| 97 | (*walk)->s = stralloc(s); |
| 98 | (*walk)->next = NULL; |
| 99 | return (*walk)->s; |
| 100 | } |
| 101 | |
| 102 | |
| 103 | void unique_cleanup(void) |
| 104 | { |
| 105 | struct unique *next; |
| 106 | |
| 107 | while (uniques) { |
| 108 | next = uniques->next; |
| 109 | free(uniques->s); |
| 110 | free(uniques); |
| 111 | uniques = next; |
| 112 | } |
| 113 | } |
| 114 | |
| 115 |
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