diff options
Diffstat (limited to 'libc')
| -rw-r--r-- | libc/stdio/printf.c | 54 |
1 files changed, 31 insertions, 23 deletions
diff --git a/libc/stdio/printf.c b/libc/stdio/printf.c index 0d918d698..91b03b31b 100644 --- a/libc/stdio/printf.c +++ b/libc/stdio/printf.c @@ -57,7 +57,7 @@ */ /* - * Manuel Novoa III Jan 2000 + * Manuel Novoa III Jan 2001 * * Removed fake file from *s*printf functions because of possible problems * if called recursively. Instead, have sprintf, snprintf, and vsprintf @@ -73,7 +73,11 @@ * Added function fnprintf to support __dtostr. * Added floating point support for doubles. Yeah! * - * TODO: long double support + * + * May 2001 Fixes from Johan Adolfsson (johan.adolfsson@axis.com) + * 1) printf("%c",0) returned 0 instead of 1. + * 2) unrolled loop in asprintf to reduce size and remove compile warning. + * */ /*****************************************************************************/ @@ -155,26 +159,29 @@ int printf(const char *fmt, ...) int asprintf(char **app, const char *fmt, ...) { va_list ptr; - int rv, i; - char *p; /* unitialized warning is ok here */ + int rv; + char *p; + /* - * First iteration - find out size of buffer required and allocate it. - * Second iteration - actually produce output. + * First iteration - find out size of buffer required and allocate it. */ - rv = 0; - for (i=0 ; i<2 ; i++) { - va_strt(ptr, fmt); - rv = vsnprintf(p, rv, fmt, ptr); - va_end(ptr); - - if (i==0) { /* first time through so */ - p = malloc(++rv); /* allocate the buffer */ - *app = p; - if (!p) { - return -1; - } - } + va_strt(ptr, fmt); + rv = vsnprintf(NULL, 0, fmt, ptr); + va_end(ptr); + + p = malloc(++rv); /* allocate the buffer */ + *app = p; + if (!p) { + return -1; } + + /* + * Second iteration - actually produce output. + */ + va_strt(ptr, fmt); + rv = vsnprintf(p, rv, fmt, ptr); + va_end(ptr); + return rv; } #endif @@ -345,7 +352,7 @@ static const char u_radix[] = "\x02\x08\x10\x10\x10\x0a"; int vfnprintf(FILE * op, size_t max_size, const char *fmt, va_list ap) { - int i, cnt, lval; + int i, cnt, lval, len; char *p; const char *fmt0; int buffer_mode; @@ -545,6 +552,9 @@ int vfnprintf(FILE * op, size_t max_size, const char *fmt, va_list ap) if (*p == 'c') { /* character */ p = tmp; *p = va_arg(ap, int); + /* This takes care of the "%c",0 case */ + len = 1; + goto print_len_set; } else { /* string */ p = va_arg(ap, char *); if (!p) { @@ -576,11 +586,9 @@ int vfnprintf(FILE * op, size_t max_size, const char *fmt, va_list ap) print: #endif { /* this used to be printfield */ - int len; - /* cheaper than strlen call */ for ( len = 0 ; p[len] ; len++ ) { } - + print_len_set: if ((*p == '-') #if WANT_GNU_ERRNO && (*fmt != 'm') |