snprintf.cpp

UPX 源代码

    char ch;
    LLONG value;
#if !defined(NO_FLOAT)
    LDOUBLE fvalue;
#endif
    const char *strvalue;
    int min;
    int max;
    int state;
    int flags;
    int cflags;
    size_t currlen;

    state = DP_S_DEFAULT;
    currlen = flags = cflags = min = 0;
    max = -1;
    ch = *format++;

    while (state != DP_S_DONE) {
        if (ch == '\0')
            state = DP_S_DONE;

        switch(state) {
        case DP_S_DEFAULT:
            if (ch == '%')
                state = DP_S_FLAGS;
            else
                dopr_outch (buffer, &currlen, maxlen, ch);
            ch = *format++;
            break;
        case DP_S_FLAGS:
            switch (ch) {
            case '-':
                flags |= DP_F_MINUS;
                ch = *format++;
                break;
            case '+':
                flags |= DP_F_PLUS;
                ch = *format++;
                break;
            case ' ':
                flags |= DP_F_SPACE;
                ch = *format++;
                break;
            case '#':
                flags |= DP_F_NUM;
                ch = *format++;
                break;
            case '0':
                flags |= DP_F_ZERO;
                ch = *format++;
                break;
            default:
                state = DP_S_MIN;
                break;
            }
            break;
        case DP_S_MIN:
            if (isdigit((unsigned char)ch)) {
                min = 10*min + char_to_int(ch);
                ch = *format++;
            } else if (ch == '*') {
                min = va_arg (args, int);
                ch = *format++;
                state = DP_S_DOT;
            } else {
                state = DP_S_DOT;
            }
            break;
        case DP_S_DOT:
            if (ch == '.') {
                state = DP_S_MAX;
                ch = *format++;
            } else {
                state = DP_S_MOD;
            }
            break;
        case DP_S_MAX:
            if (isdigit((unsigned char)ch)) {
                if (max < 0)
                    max = 0;
                max = 10*max + char_to_int(ch);
                ch = *format++;
            } else if (ch == '*') {
                max = va_arg (args, int);
                ch = *format++;
                state = DP_S_MOD;
            } else {
                state = DP_S_MOD;
            }
            break;
        case DP_S_MOD:
            switch (ch) {
            case 'h':
                cflags = DP_C_SHORT;
                ch = *format++;
                break;
            case 'l':
                cflags = DP_C_LONG;
                ch = *format++;
                if (ch == 'l') {    /* It's a long long */
                    cflags = DP_C_LLONG;
                    ch = *format++;
                }
                break;
            case 'L':
                cflags = DP_C_LDOUBLE;
                ch = *format++;
                break;
            default:
                break;
            }
            state = DP_S_CONV;
            break;
        case DP_S_CONV:
            switch (ch) {
            case 'd':
            case 'i':
                if (cflags == DP_C_SHORT)
                    value = va_arg (args, int);
                else if (cflags == DP_C_LONG)
                    value = va_arg (args, long int);
                else if (cflags == DP_C_LLONG)
                    value = va_arg (args, LLONG);
                else
                    value = va_arg (args, int);
                fmtint (buffer, &currlen, maxlen, value, 10, min, max, flags);
                break;
            case 'o':
                flags |= DP_F_UNSIGNED;
                if (cflags == DP_C_SHORT)
                    value = va_arg (args, unsigned int);
                else if (cflags == DP_C_LONG)
                    value = (long)va_arg (args, unsigned long int);
                else if (cflags == DP_C_LLONG)
                    value = (long)va_arg (args, ULLONG);
                else
                    value = (long)va_arg (args, unsigned int);
                fmtint (buffer, &currlen, maxlen, value, 8, min, max, flags);
                break;
            case 'u':
                flags |= DP_F_UNSIGNED;
                if (cflags == DP_C_SHORT)
                    value = va_arg (args, unsigned int);
                else if (cflags == DP_C_LONG)
                    value = (long)va_arg (args, unsigned long int);
                else if (cflags == DP_C_LLONG)
                    value = (LLONG)va_arg (args, ULLONG);
                else
                    value = (long)va_arg (args, unsigned int);
                fmtint (buffer, &currlen, maxlen, value, 10, min, max, flags);
                break;
            case 'X':
                flags |= DP_F_UP;
            case 'x':
                flags |= DP_F_UNSIGNED;
                if (cflags == DP_C_SHORT)
                    value = va_arg (args, unsigned int);
                else if (cflags == DP_C_LONG)
                    value = (long)va_arg (args, unsigned long int);
                else if (cflags == DP_C_LLONG)
                    value = (LLONG)va_arg (args, ULLONG);
                else
                    value = (long)va_arg (args, unsigned int);
                fmtint (buffer, &currlen, maxlen, value, 16, min, max, flags);
                break;
#if !defined(NO_FLOAT)
            case 'f':
                if (cflags == DP_C_LDOUBLE)
                    fvalue = va_arg (args, LDOUBLE);
                else
                    fvalue = va_arg (args, double);
                /* um, floating point? */
                fmtfp (buffer, &currlen, maxlen, fvalue, min, max, flags);
                break;
            case 'E':
                flags |= DP_F_UP;
            case 'e':
                if (cflags == DP_C_LDOUBLE)
                    fvalue = va_arg (args, LDOUBLE);
                else
                    fvalue = va_arg (args, double);
                break;
            case 'G':
                flags |= DP_F_UP;
            case 'g':
                if (cflags == DP_C_LDOUBLE)
                    fvalue = va_arg (args, LDOUBLE);
                else
                    fvalue = va_arg (args, double);
                break;
#else
            case 'f':
            case 'E':
            case 'e':
            case 'G':
            case 'g':
                assert(0);
                exit(255);
#endif /* !defined(NO_FLOAT) */
            case 'c':
                dopr_outch (buffer, &currlen, maxlen, va_arg (args, int));
                break;
            case 's':
                strvalue = va_arg (args, const char *);
                if (!strvalue) strvalue = "(NULL)";
                if (max == -1) {
                    max = (int) strlen(strvalue);
                }
                if (min > 0 && max >= 0 && min > max) max = min;
                fmtstr (buffer, &currlen, maxlen, strvalue, flags, min, max);
                break;
            case 'p':
                strvalue = (const char *) va_arg (args, const void *);
                fmtint (buffer, &currlen, maxlen, (LLONG) (acc_uintptr_t) strvalue, 16, min, max, flags);
                break;
            case 'n':
                if (cflags == DP_C_SHORT) {
                    short int *num;
                    num = va_arg (args, short int *);
                    *num = (short int)currlen;
                } else if (cflags == DP_C_LONG) {
                    long int *num;
                    num = va_arg (args, long int *);
                    *num = (long int)currlen;
                } else if (cflags == DP_C_LLONG) {
                    LLONG *num;
                    num = va_arg (args, LLONG *);
                    *num = (LLONG)currlen;
                } else {
                    int *num;
                    num = va_arg (args, int *);
                    *num = (int) currlen;
                }
                break;
            case '%':
                dopr_outch (buffer, &currlen, maxlen, ch);
                break;
            case 'w':
                /* not supported yet, treat as next char */
                ch = *format++;
                break;
            default:
                /* Unknown, skip */
                break;
            }
            ch = *format++;
            state = DP_S_DEFAULT;
            flags = cflags = min = 0;
            max = -1;
            break;
        case DP_S_DONE:
            break;
        default:
            /* hmm? */
            break; /* some picky compilers need this */
        }
    }
    if (maxlen != 0) {
        if (currlen < maxlen - 1)
            buffer[currlen] = '\0';
        else
            buffer[maxlen - 1] = '\0';
    }

    return currlen;
}


/*************************************************************************
// public entries
**************************************************************************/

// UPX version with assertions
static int xdopr(char *buffer, size_t maxlen, const char *format, va_list args)
{
    size_t ret;

    // preconditions
    assert(maxlen < INT_MAX);
    if (buffer != NULL)
        assert((int)maxlen > 0);
    else
        assert(maxlen == 0);

    ret = dopr(buffer, maxlen, format, args);

    // postconditions
    if (buffer != NULL)
    {
        assert((int)ret >= 0);
        assert(ret < maxlen);
        assert(buffer[ret] == '\0');
    }

    return (int) ret;
}


int __acc_cdecl upx_vsnprintf(char *str, size_t count, const char *format, va_list ap)
{
    return xdopr(str, count, format, ap);
}


int __acc_cdecl_va upx_snprintf(char *str, size_t count, const char *format,...)
{
    va_list ap;
    int ret;

    va_start(ap, format);
    ret = xdopr(str, count, format, ap);
    va_end(ap);
    return ret;
}


int __acc_cdecl upx_vasprintf(char **ptr, const char *format, va_list ap)
{
    int ret;

    assert(ptr != NULL);
    *ptr = NULL;
    ret = xdopr(NULL, 0, format, ap);
    if (ret > 0)
    {
        *ptr = (char *) malloc(ret + 1);
        assert(*ptr != NULL);
        if (*ptr == NULL)
            return -1;
        ret = xdopr(*ptr, ret+1, format, ap);
    }
    return ret;
}


int __acc_cdecl_va upx_asprintf(char **ptr, const char *format, ...)
{
    va_list ap;
    int ret;

    va_start(ap, format);
    ret = upx_vasprintf(ptr, format, ap);
    va_end(ap);
    return ret;
}


/*************************************************************************
 //
**************************************************************************/

#if 0 || defined(TEST_SNPRINTF)

#undef sprintf
#include <stdio.h>
#include <string.h>
#include <math.h>

#undef snprintf
#define snprintf    upx_snprintf
//int sprintf(char *str,const char *fmt,...);

int main(void)
{
    char buf1[1024];
    char buf2[1024];
    const char *fp_fmt[] = {
        "%1.1f",
        "%-1.5f",
        "%1.5f",
        "%123.9f",
        "%10.5f",
        "% 10.5f",
        "%+22.9f",
        "%+4.9f",
        "%01.3f",
        "%4f",
        "%3.1f",
        "%3.2f",
        "%.0f",
        "%f",
        "-16.16f",
        NULL
    };
    const double fp_nums[] = {
        6442452944.1234, -1.5, 134.21, 91340.2, 341.1234, 0203.9, 0.96, 0.996,
        0.9996, 1.996, 4.136,  0
    };
    const char *int_fmt[] = {
        "%-1.5d",
        "%1.5d",
        "%123.9d",
        "%5.5d",
        "%10.5d",
        "% 10.5d",
        "%+22.33d",
        "%01.3d",
        "%4d",
        "%d",
        NULL
    };
    const long int_nums[] = { -1, 134, 91340, 341, 0203, 0 };
    const char *str_fmt[] = {
        "10.5s",
        "5.10s",
        "10.1s",
        "0.10s",
        "10.0s",
        "1.10s",
        "%s",
        "%.1s",
        "%.10s",
        "%10s",
        0
    };
    const char *str_vals[] = {"hello", "a", "", "a longer string", NULL};
    int x, y;
    int fail = 0;
    int num = 0;

    printf ("Testing snprintf format codes against system sprintf...\n");

    for (x = 0; fp_fmt[x] ; x++) {
        for (y = 0; fp_nums[y] != 0 ; y++) {
            int l1 = snprintf(NULL, 0, fp_fmt[x], fp_nums[y]);
            int l2 = snprintf(buf1, sizeof(buf1), fp_fmt[x], fp_nums[y]);
            sprintf (buf2, fp_fmt[x], fp_nums[y]);
            if (strcmp (buf1, buf2)) {
                printf("snprintf doesn't match Format: %s\n\tsnprintf = [%s]\n\t sprintf = [%s]\n",
                       fp_fmt[x], buf1, buf2);
                fail++;
            }
            if (l1 != l2) {
                printf("snprintf l1 != l2 (%d %d) %s\n", l1, l2, fp_fmt[x]);
                fail++;
            }
            num++;
        }
    }

    for (x = 0; int_fmt[x] ; x++) {
        for (y = 0; int_nums[y] != 0 ; y++) {
            int l1 = snprintf(0, 0, int_fmt[x], int_nums[y]);
            int l2 = snprintf(buf1, sizeof(buf1), int_fmt[x], int_nums[y]);
            sprintf (buf2, int_fmt[x], int_nums[y]);
            if (strcmp (buf1, buf2)) {
                printf("snprintf doesn't match Format: %s\n\tsnprintf = [%s]\n\t sprintf = [%s]\n",
                       int_fmt[x], buf1, buf2);
                fail++;
            }
            if (l1 != l2) {
                printf("snprintf l1 != l2 (%d %d) %s\n", l1, l2, int_fmt[x]);
                fail++;
            }
            num++;
        }
    }

    for (x = 0; str_fmt[x] ; x++) {
        for (y = 0; str_vals[y] != 0 ; y++) {
            int l1 = snprintf(NULL, 0, str_fmt[x], str_vals[y]);
            int l2 = snprintf(buf1, sizeof(buf1), str_fmt[x], str_vals[y]);
            sprintf (buf2, str_fmt[x], str_vals[y]);
            if (strcmp (buf1, buf2)) {
                printf("snprintf doesn't match Format: %s\n\tsnprintf = [%s]\n\t sprintf = [%s]\n",
                       str_fmt[x], buf1, buf2);
                fail++;
            }
            if (l1 != l2) {
                printf("snprintf l1 != l2 (%d %d) %s\n", l1, l2, str_fmt[x]);
                fail++;
            }
            num++;
        }
    }

    printf ("%d tests failed out of %d.\n", fail, num);

    printf("seeing how many digits we support\n");
    {
        double v0 = 0.12345678901234567890123456789012345678901;
        for (x=0; x<100; x++) {
            snprintf(buf1, sizeof(buf1), "%1.1f", v0*pow(10, x));
            sprintf(buf2,                "%1.1f", v0*pow(10, x));
            if (strcmp(buf1, buf2) != 0) {
                printf("we seem to support %d digits\n", x-1);
                break;
            }
        }
    }

    return 0;
}
#endif /* SNPRINTF_TEST */

/*
vi:ts=4:et
*/