| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * Format a string to a buffer |
| 4 | * |
| 5 | * (c) 2023 Straylight/Edgeware |
| 6 | */ |
| 7 | |
| 8 | /*----- Licensing notice --------------------------------------------------* |
| 9 | * |
| 10 | * This file is part of the mLib utilities library. |
| 11 | * |
| 12 | * mLib is free software: you can redistribute it and/or modify it under |
| 13 | * the terms of the GNU Library General Public License as published by |
| 14 | * the Free Software Foundation; either version 2 of the License, or (at |
| 15 | * your option) any later version. |
| 16 | * |
| 17 | * mLib is distributed in the hope that it will be useful, but WITHOUT |
| 18 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 19 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public |
| 20 | * License for more details. |
| 21 | * |
| 22 | * You should have received a copy of the GNU Library General Public |
| 23 | * License along with mLib. If not, write to the Free Software |
| 24 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, |
| 25 | * USA. |
| 26 | */ |
| 27 | |
| 28 | /*----- Header files ------------------------------------------------------*/ |
| 29 | |
| 30 | #include "config.h" |
| 31 | |
| 32 | #include <stdarg.h> |
| 33 | #include <stddef.h> |
| 34 | #include <stdio.h> |
| 35 | |
| 36 | #include "buf.h" |
| 37 | #include "gprintf.h" |
| 38 | |
| 39 | /*----- Main code ---------------------------------------------------------*/ |
| 40 | |
| 41 | /* --- @buf_vputstrf@ --- * |
| 42 | * |
| 43 | * Arguments: @buf *b@ = pointer to a buffer |
| 44 | * @const char *p@ = pointer to @printf@-style format string |
| 45 | * @va_list *ap@ = argument handle |
| 46 | * |
| 47 | * Returns: The number of characters written to the string, or @-1@ on |
| 48 | * failure. |
| 49 | * |
| 50 | * Use: As for @buf_putstrf@, but may be used as a back-end to user- |
| 51 | * supplied functions with @printf@-style interfaces. |
| 52 | */ |
| 53 | |
| 54 | static int putch(void *out, int ch) |
| 55 | { buf *b = out; return (buf_putbyte(b, ch)); } |
| 56 | |
| 57 | static int putm(void *out, const char *p, size_t sz) |
| 58 | { buf *b = out; return (buf_put(b, p, sz)); } |
| 59 | |
| 60 | static int nputf(void *out, size_t maxsz, const char *p, ...) |
| 61 | { |
| 62 | buf *b = out; |
| 63 | va_list ap; |
| 64 | int n; |
| 65 | |
| 66 | va_start(ap, p); |
| 67 | if (BENSURE(b, maxsz + 1)) return (-1); |
| 68 | #ifdef HAVE_SNPRINTF |
| 69 | n = vsnprintf((char *)BCUR(b), maxsz + 1, p, ap); |
| 70 | #else |
| 71 | n = vsprintf((char *)BCUR(b), p, ap); |
| 72 | #endif |
| 73 | assert(0 <= n && n <= maxsz); |
| 74 | va_end(ap); b->p += n; return (n); |
| 75 | } |
| 76 | |
| 77 | const struct gprintf_ops buf_printops = |
| 78 | { putch, putm, nputf }; |
| 79 | |
| 80 | int buf_vputstrf(buf *b, const char *p, va_list *ap) |
| 81 | { return (vgprintf(&buf_printops, b, p, ap)); } |
| 82 | |
| 83 | /* --- @buf_putstrf@ --- * |
| 84 | * |
| 85 | * Arguments: @buf *b@ = pointer to a buffer |
| 86 | * @const char *p@ = pointer to @printf@-style format string |
| 87 | * @...@ = argument handle |
| 88 | * |
| 89 | * Returns: The number of characters written to the string, or @-1@ on |
| 90 | * failure. |
| 91 | * |
| 92 | * Use: Format a string to a buffer. The resulting output is not |
| 93 | * null-terminated. |
| 94 | */ |
| 95 | |
| 96 | int buf_putstrf(buf *b, const char *p, ...) |
| 97 | { |
| 98 | va_list ap; |
| 99 | int n; |
| 100 | |
| 101 | va_start(ap, p); n = buf_vputstrf(b, p, &ap); va_end(ap); |
| 102 | return (n); |
| 103 | } |
| 104 | |
| 105 | /* --- @buf_{,v}putstrf{8,{16,24,32,64}{,b,l},z}@ --- * |
| 106 | * |
| 107 | * Arguments: @buf *b@ = pointer to a buffer |
| 108 | * @const char *p@ = pointer to @printf@-style format string |
| 109 | * @va_list *ap@ = argument handle |
| 110 | * |
| 111 | * Returns: The number of characters written to the string, or @-1@ on |
| 112 | * failure. |
| 113 | * |
| 114 | * Use: As for @buf_putstr@, but using a format string. |
| 115 | */ |
| 116 | |
| 117 | #define BUF_DEF_VPUTSTRF_(n, W, w) \ |
| 118 | int buf_vputstrf##w(buf *b, const char *p, va_list *ap) \ |
| 119 | { \ |
| 120 | size_t mk; \ |
| 121 | int nn; \ |
| 122 | \ |
| 123 | BUF_ENCLOSE##W(b, mk) nn = buf_vputstrf(b, p, ap); \ |
| 124 | return (BOK(b) ? nn : -1); \ |
| 125 | } |
| 126 | DOUINTCONV(BUF_DEF_VPUTSTRF_) |
| 127 | BUF_DOKLUDGESUFFIXES(BUF_DEF_VPUTSTRF_) |
| 128 | #undef BUF_DEF_VPUTSTRF_ |
| 129 | |
| 130 | int buf_vputstrfz(buf *b, const char *p, va_list *ap) |
| 131 | { |
| 132 | int nn; |
| 133 | |
| 134 | BUF_ENCLOSEZ(b) nn = buf_vputstrf(b, p, ap); |
| 135 | return (BOK(b) ? nn : -1); |
| 136 | } |
| 137 | |
| 138 | #define BUF_DEF_PUTSTRF_(n, W, w) \ |
| 139 | int buf_putstrf##w(buf *b, const char *p, ...) \ |
| 140 | { \ |
| 141 | va_list ap; \ |
| 142 | int nn; \ |
| 143 | \ |
| 144 | va_start(ap, p); nn = buf_vputstrf##w(b, p, &ap); va_end(ap); \ |
| 145 | return (nn); \ |
| 146 | } |
| 147 | BUF_DOSUFFIXES(BUF_DEF_PUTSTRF_) |
| 148 | #undef BUF_DEF_PUTSTRF_ |
| 149 | |
| 150 | /*----- That's all, folks -------------------------------------------------*/ |