icuSources/io/uprintf.cpp

   1 // © 2016 and later: Unicode, Inc. and others.
   2 // License & terms of use: http://www.unicode.org/copyright.html
   3 /*
   4 ******************************************************************************
   5 *
   6 *   Copyright (C) 1998-2014, International Business Machines
   7 *   Corporation and others.  All Rights Reserved.
   8 *
   9 ******************************************************************************
  10 *
  11 * File uprintf.cpp
  12 *
  13 * Modification History:
  14 *
  15 *   Date        Name        Description
  16 *   11/19/98    stephen     Creation.
  17 *   03/12/99    stephen     Modified for new C API.
  18 *                           Added conversion from default codepage.
  19 *   08/07/2003  george      Reunify printf implementations
  20 ******************************************************************************
  21 */
  22
  23 #include "unicode/utypes.h"
  24
  25 #if !UCONFIG_NO_FORMATTING && !UCONFIG_NO_CONVERSION
  26
  27 #include "unicode/ustdio.h"
  28 #include "unicode/ustring.h"
  29 #include "unicode/unum.h"
  30 #include "unicode/udat.h"
  31 #include "unicode/putil.h"
  32
  33 #include "cmemory.h"
  34 #include "locbund.h"
  35 #include "mutex.h"
  36 #include "uassert.h"
  37 #include "uprintf.h"
  38 #include "ufile.h"
  39 #include "ucln_io.h"
  40
  41 U_NAMESPACE_USE
  42
  43 static UFILE *gStdOut = NULL;
  44 static UInitOnce gStdOutInitOnce = U_INITONCE_INITIALIZER;
  45
  46 static UBool U_CALLCONV uprintf_cleanup(void)
  47 {
  48     if (gStdOut != NULL) {
  49         u_fclose(gStdOut);
  50         gStdOut = NULL;
  51     }
  52     gStdOutInitOnce.reset();
  53     return TRUE;
  54 }
  55
  56 static void U_CALLCONV u_stdout_init() {
  57     U_ASSERT(gStdOut ==  NULL);
  58     gStdOut = u_finit(stdout, NULL, NULL);
  59     ucln_io_registerCleanup(UCLN_IO_PRINTF, &uprintf_cleanup);
  60 }
  61
  62 U_CAPI UFILE * U_EXPORT2
  63 u_get_stdout()
  64 {
  65     umtx_initOnce(gStdOutInitOnce, &u_stdout_init);
  66     return gStdOut;
  67 }
  68
  69 static int32_t U_EXPORT2
  70 u_printf_write(void          *context,
  71                const UChar   *str,
  72                int32_t       count)
  73 {
  74     return u_file_write(str, count, (UFILE *)context);
  75 }
  76
  77 static int32_t
  78 u_printf_pad_and_justify(void                        *context,
  79                          const u_printf_spec_info    *info,
  80                          const UChar                 *result,
  81                          int32_t                     resultLen)
  82 {
  83     UFILE   *output = (UFILE *)context;
  84     int32_t written, i;
  85
  86     /* pad and justify, if needed */
  87     if(info->fWidth != -1 && resultLen < info->fWidth) {
  88         /* left justify */
  89         if(info->fLeft) {
  90             written = u_file_write(result, resultLen, output);
  91             for(i = 0; i < info->fWidth - resultLen; ++i) {
  92                 written += u_file_write(&info->fPadChar, 1, output);
  93             }
  94         }
  95         /* right justify */
  96         else {
  97             written = 0;
  98             for(i = 0; i < info->fWidth - resultLen; ++i) {
  99                 written += u_file_write(&info->fPadChar, 1, output);
 100             }
 101             written += u_file_write(result, resultLen, output);
 102         }
 103     }
 104     /* just write the formatted output */
 105     else {
 106         written = u_file_write(result, resultLen, output);
 107     }
 108
 109     return written;
 110 }
 111
 112 U_CAPI int32_t U_EXPORT2
 113 u_fprintf(    UFILE        *f,
 114           const char    *patternSpecification,
 115           ... )
 116 {
 117     va_list ap;
 118     int32_t count;
 119
 120     va_start(ap, patternSpecification);
 121     count = u_vfprintf(f, patternSpecification, ap);
 122     va_end(ap);
 123
 124     return count;
 125 }
 126
 127 U_CAPI int32_t U_EXPORT2
 128 u_printf(const char *patternSpecification,
 129          ...)
 130 {
 131     va_list ap;
 132     int32_t count;
 133     va_start(ap, patternSpecification);
 134     count = u_vfprintf(u_get_stdout(), patternSpecification, ap);
 135     va_end(ap);
 136     return count;
 137 }
 138
 139 U_CAPI int32_t U_EXPORT2
 140 u_fprintf_u(    UFILE        *f,
 141             const UChar    *patternSpecification,
 142             ... )
 143 {
 144     va_list ap;
 145     int32_t count;
 146
 147     va_start(ap, patternSpecification);
 148     count = u_vfprintf_u(f, patternSpecification, ap);
 149     va_end(ap);
 150
 151     return count;
 152 }
 153
 154 U_CAPI int32_t U_EXPORT2
 155 u_printf_u(const UChar *patternSpecification,
 156            ...)
 157 {
 158     va_list ap;
 159     int32_t count;
 160     va_start(ap, patternSpecification);
 161     count = u_vfprintf_u(u_get_stdout(), patternSpecification, ap);
 162     va_end(ap);
 163     return count;
 164 }
 165
 166 U_CAPI int32_t  U_EXPORT2 /* U_CAPI ... U_EXPORT2 added by Peter Kirk 17 Nov 2001 */
 167 u_vfprintf(    UFILE        *f,
 168            const char    *patternSpecification,
 169            va_list        ap)
 170 {
 171     int32_t count;
 172     UChar *pattern;
 173     UChar buffer[UFMT_DEFAULT_BUFFER_SIZE];
 174     size_t size = strlen(patternSpecification) + 1;
 175
 176     /* convert from the default codepage to Unicode */
 177     if (size >= MAX_UCHAR_BUFFER_SIZE(buffer)) {
 178         pattern = (UChar *)uprv_malloc(size * sizeof(UChar));
 179         if(pattern == 0) {
 180             return 0;
 181         }
 182     }
 183     else {
 184         pattern = buffer;
 185     }
 186     u_charsToUChars(patternSpecification, pattern, size);
 187
 188     /* do the work */
 189     count = u_vfprintf_u(f, pattern, ap);
 190
 191     /* clean up */
 192     if (pattern != buffer) {
 193         uprv_free(pattern);
 194     }
 195
 196     return count;
 197 }
 198
 199 static const u_printf_stream_handler g_stream_handler = {
 200     u_printf_write,
 201     u_printf_pad_and_justify
 202 };
 203
 204 U_CAPI int32_t  U_EXPORT2 /* U_CAPI ... U_EXPORT2 added by Peter Kirk 17 Nov 2001 */
 205 u_vfprintf_u(    UFILE        *f,
 206              const UChar    *patternSpecification,
 207              va_list        ap)
 208 {
 209     int32_t          written = 0;   /* haven't written anything yet */
 210
 211     /* parse and print the whole format string */
 212     u_printf_parse(&g_stream_handler, patternSpecification, f, NULL, &f->str.fBundle, &written, ap);
 213
 214     /* return # of UChars written */
 215     return written;
 216 }
 217
 218 #endif /* #if !UCONFIG_NO_FORMATTING */
 219