106 lines
2.3 KiB
C
106 lines
2.3 KiB
C
#include <stdio.h>
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#include <ctype.h>
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#include <string.h>
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extern char * _argv_0;
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extern int __libc_debug;
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int vsscanf(const char *str, const char *format, va_list ap) {
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if (__libc_debug) fprintf(stderr, "%s: sscanf(\"%s\", format=\"%s\", ...);\n", _argv_0, str, format);
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int count = 0;
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while (*format) {
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if (*format == ' ') {
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/* handle white space */
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while (*str && isspace(*str)) {
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str++;
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}
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} else if (*format == '%') {
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/* Parse */
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format++;
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int _long = 0;
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if (*format == 'l') {
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format++;
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if (*format == 'l') {
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_long = 1;
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if (__libc_debug) fprintf(stderr, "%s: \033[33;3mWarning\033[0m: Need to scan a large pointer (%d)\n", _argv_0, _long);
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format++;
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}
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}
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if (*format == 'd') {
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int i = 0;
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int sign = 1;
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if (*str == '-') {
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sign = -1;
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str++;
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}
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while (*str && *str > '0' && *str < '9') {
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i = i * 10 + *str - '0';
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str++;
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}
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int * out = (int *)va_arg(ap, int*);
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if (__libc_debug) fprintf(stderr, "%s: sscanf: out %d\n", _argv_0, i);
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count++;
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*out = i * sign;
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} else if (*format == 'u') {
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unsigned int i = 0;
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while (*str && *str > '0' && *str < '9') {
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i = i * 10 + *str - '0';
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str++;
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}
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unsigned int * out = (unsigned int *)va_arg(ap, unsigned int*);
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if (__libc_debug) fprintf(stderr, "%s: sscanf: out %d\n", _argv_0, i);
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count++;
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*out = i;
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}
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} else {
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/* Expect exact character? */
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if (*str == *format) {
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str++;
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}
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}
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format++;
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}
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return count;
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}
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int vfscanf(FILE * stream, const char *format, va_list ap) {
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if (__libc_debug) fprintf(stderr, "%s: fscanf(%d, format=%s, ...);\n", _argv_0, fileno(stream), format);
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while (*format) {
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if (*format == ' ') {
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/* Handle whitespace */
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} else if (*format == '%') {
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/* Parse */
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} else {
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/* Expect exact character? */
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}
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format++;
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}
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return 0;
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}
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int sscanf(const char *str, const char *format, ...) {
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va_list args;
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va_start(args, format);
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int out = vsscanf(str, format, args);
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va_end(args);
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return out;
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}
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int fscanf(FILE *stream, const char *format, ...) {
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va_list args;
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va_start(args, format);
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int out = vfscanf(stream, format, args);
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va_end(args);
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return out;
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}
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int scanf(const char *format, ...) {
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va_list args;
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va_start(args, format);
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int out = vfscanf(stdin, format, args);
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va_end(args);
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return out;
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}
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