diff options
Diffstat (limited to 'stdio/vfscanf.c')
| -rw-r--r-- | stdio/vfscanf.c | 75 |
1 files changed, 54 insertions, 21 deletions
diff --git a/stdio/vfscanf.c b/stdio/vfscanf.c index 9a9e3bb79c..cacf16f466 100644 --- a/stdio/vfscanf.c +++ b/stdio/vfscanf.c @@ -60,7 +60,7 @@ DEFUN(__vfscanf, (s, format, arg), int group_flag; /* %' modifier flag. */ /* Type modifiers. */ - char is_short, is_long, is_long_double; + int is_short, is_long, is_long_double; #ifdef HAVE_LONGLONG /* We use the `L' modifier for `long long int'. */ #define is_longlong is_long_double @@ -108,6 +108,18 @@ DEFUN(__vfscanf, (s, format, arg), /* Run through the format string. */ while (*f != '\0') { + unsigned int argpos; + /* Extract the next argument, which is of type TYPE. + For a %N$... spec, this is the Nth argument from the beginning; + otherwise it is the next argument after the state now in ARG. */ +#define ARG(type) (argpos == 0 ? va_arg (arg, type) : \ + ({ unsigned int pos = argpos; \ + va_list arg = (va_list) argptr; \ + while (--pos > 0) \ + (void) va_arg (arg, void *); \ + va_arg (arg, type); \ + })) + if (!isascii (*f)) { /* Non-ASCII, may be a multibyte. */ @@ -145,9 +157,30 @@ DEFUN(__vfscanf, (s, format, arg), continue; } - /* Check for the assignment-suppressant and the number grouping flag. */ + /* Initialize state of modifiers. */ + argpos = 0; do_assign = 1; group_flag = 0; + is_short = is_long = is_long_double = malloc_string = 0; + + /* Check for a positional parameter specification. */ + if (isdigit (*f)) + { + argpos = *f++ - '0'; + while (isdigit (*f)) + argpos = argpos * 10 + (*f++ - '0'); + if (*f == '$') + ++f; + else + { + /* Oops; that was actually the field width. */ + width = argpos; + argpos = 0; + goto got_width; + } + } + + /* Check for the assignment-suppressant and the number grouping flag. */ while (*f == '*' || *f == '\'') switch (*f++) { @@ -166,11 +199,11 @@ DEFUN(__vfscanf, (s, format, arg), width *= 10; width += *f++ - '0'; } + got_width: if (width == 0) width = -1; /* Check for type modifiers. */ - is_short = is_long = is_long_double = malloc_string = 0; while (*f == 'h' || *f == 'l' || *f == 'L' || *f == 'a' || *f == 'q') switch (*f++) { @@ -218,13 +251,13 @@ DEFUN(__vfscanf, (s, format, arg), case 'n': /* Answer number of assignments done. */ if (do_assign) - *va_arg(arg, int *) = read_in; + *ARG (int *) = read_in; break; case 'c': /* Match characters. */ if (do_assign) { - str = va_arg (arg, char *); + str = ARG (char *); if (str == NULL) conv_error (); } @@ -256,7 +289,7 @@ DEFUN(__vfscanf, (s, format, arg), if (malloc_string) \ { \ /* The string is to be stored in a malloc'd buffer. */ \ - strptr = va_arg (arg, char **); \ + strptr = ARG (char **); \ if (strptr == NULL) \ conv_error (); \ /* Allocate an initial buffer. */ \ @@ -264,7 +297,7 @@ DEFUN(__vfscanf, (s, format, arg), *strptr = str = malloc (strsize); \ } \ else \ - str = va_arg (arg, char *); \ + str = ARG (char *); \ if (str == NULL) \ conv_error (); \ } @@ -406,16 +439,16 @@ DEFUN(__vfscanf, (s, format, arg), /* Convert the number. */ *w = '\0'; - if (number_signed) + if (is_longlong) { - if (is_longlong) + if (number_signed) num.q = __strtoq_internal (work, &w, base, group_flag); else num.uq = __strtouq_internal (work, &w, base, group_flag); } else { - if (is_long_double) + if (number_signed) num.l = __strtol_internal (work, &w, base, group_flag); else num.ul = __strtoul_internal (work, &w, base, group_flag); @@ -428,25 +461,25 @@ DEFUN(__vfscanf, (s, format, arg), if (! number_signed) { if (is_longlong) - *va_arg (arg, unsigned LONGLONG int *) = num.uq; + *ARG (unsigned LONGLONG int *) = num.uq; else if (is_long) - *va_arg (arg, unsigned long int *) = num.ul; + *ARG (unsigned long int *) = num.ul; else if (is_short) - *va_arg (arg, unsigned short int *) + *ARG (unsigned short int *) = (unsigned short int) num.ul; else - *va_arg (arg, unsigned int *) = (unsigned int) num.ul; + *ARG (unsigned int *) = (unsigned int) num.ul; } else { if (is_longlong) - *va_arg (arg, LONGLONG int *) = num.q; + *ARG (LONGLONG int *) = num.q; else if (is_long) - *va_arg (arg, long int *) = num.l; + *ARG (long int *) = num.l; else if (is_short) - *va_arg (arg, short int *) = (short int) num.l; + *ARG (short int *) = (short int) num.l; else - *va_arg (arg, int *) = (int) num.l; + *ARG (int *) = (int) num.l; } ++done; } @@ -505,19 +538,19 @@ DEFUN(__vfscanf, (s, format, arg), { long double d = __strtold_internal (work, &w, group_flag); if (do_assign && w != work) - *va_arg (arg, long double *) = d; + *ARG (long double *) = d; } else if (is_long) { double d = __strtod_internal (work, &w, group_flag); if (do_assign && w != work) - *va_arg (arg, double *) = d; + *ARG (double *) = d; } else { float d = __strtof_internal (work, &w, group_flag); if (do_assign && w != work) - *va_arg (arg, float *) = d; + *ARG (float *) = d; } if (w == work) |