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Viewing changes to bin/trampoline/norm.c

  • Committer: David Coles
  • Date: 2010-07-20 05:42:59 UTC
  • Revision ID: coles.david@gmail.com-20100720054259-j4xyqagognlis8wh
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bin/trampoline/norm.c
 
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#include <assert.h>
 
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#include <string.h>
 
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#include <stdlib.h>
 
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#include <stdio.h>
 
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#include <unistd.h>
 
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#include "norm.h"
 
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#define SKP()               \
 
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    do {                    \
 
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        s++;                \
 
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    } while (0)
 
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#define CPY()               \
 
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    do {                    \
 
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        *d++ = *s++;        \
 
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    } while (0)
 
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#define MRK()               \
 
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    do {                    \
 
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        PUSH();             \
 
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    } while (0)
 
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#define BKP()               \
 
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    do {                    \
 
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        POP();              \
 
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    } while (0)
 
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#define BKP2()              \
 
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    do {                    \
 
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        POP();              \
 
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        POP();              \
 
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    } while (0)
 
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#define PUSH()              \
 
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    do {                    \
 
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        stk[top++] = d;     \
 
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    } while (0)
 
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#define POP()               \
 
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    do {                    \
 
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        if (top == 0)       \
 
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        {                   \
 
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            dest[0] = '\0'; \
 
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            return -1;      \
 
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        }                   \
 
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        d = stk[--top];     \
 
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    } while (0)
 
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/*
 
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 * Normalize the unix pathname in src eliminating . and .. sequences
 
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 * to yield an absolute path. Returns 0 on success, and -1 on error.
 
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 */
 
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int norm(char* dest, int len, const char* src)
 
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{
 
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    const char* s = src;
 
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    char* d = dest;
 
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    char* stk[256];
 
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    int top = 0;
 
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    enum { L0, L1, L2, L3, L4 } state = L0;
 
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    assert(strlen(src) <= len);
 
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    while (*s)
 
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    {
 
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        char c = *s;
 
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        enum { slash, dot, other } cls;
 
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        switch (c)
 
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        {
 
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            case '/':
 
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            {
 
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                cls = slash;
 
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                break;
 
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            }
 
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            case '.':
 
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            {
 
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                cls = dot;
 
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                break;
 
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            }
 
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            default:
 
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            {
 
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                cls = other;
 
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            }
 
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        }
 
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        switch (state)
 
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        {
 
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            case L0:
 
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            {
 
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                switch (cls)
 
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                {
 
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                    case slash:
 
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                    {
 
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                        CPY();
 
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                        state = L1;
 
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                        break;
 
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                    }
 
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                    case dot:
 
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                    case other:
 
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                    {
 
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                        dest[0] = '\0';
 
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                        return -1;
 
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                    }
 
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                }
 
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                break;
 
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            }
 
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            case L1:
 
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            {
 
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                switch (cls)
 
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                {
 
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                    case slash:
 
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                    {
 
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                        SKP();
 
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                        break;
 
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                    }
 
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                    case dot:
 
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                    {
 
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                        MRK();
 
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                        CPY();
 
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                        state = L2;
 
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                        break;
 
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                    }
 
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                    case other:
 
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                    {
 
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                        MRK();
 
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                        CPY();
 
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                        state = L4;
 
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                        break;
 
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                    }
 
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                }
 
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                break;
 
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            }
 
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            case L2:
 
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            {
 
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                switch (cls)
 
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                {
 
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                    case slash:
 
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                    {
 
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                        BKP();
 
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                        state = L1;
 
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                        break;
 
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                    }
 
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                    case dot:
 
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                    {
 
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                        CPY();
 
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                        state = L3;
 
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                        break;
 
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                    }
 
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                    case other:
 
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                    {
 
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                        CPY();
 
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                        state = L4;
 
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                        break;
 
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                    }
 
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                }
 
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                break;
 
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            }
 
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            case L3:
 
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            {
 
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                switch (cls)
 
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                {
 
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                    case slash:
 
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                    {
 
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                        BKP2();
 
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                        state = L1;
 
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                        break;
 
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                    }
 
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                    case dot:
 
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                    case other:
 
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                    {
 
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                        CPY();
 
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                        state = L4;
 
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                        break;
 
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                    }
 
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                }
 
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                break;
 
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            }
 
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            case L4:
 
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            {
 
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                switch (cls)
 
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                {
 
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                    case slash:
 
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                    {
 
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                        CPY();
 
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                        state = L1;
 
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                        break;
 
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                    }
 
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                    case dot:
 
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                    case other:
 
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                    {
 
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                        CPY();
 
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                        break;
 
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                    }
 
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                }
 
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                break;
 
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            }
 
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        }
 
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    }
 
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    *d = '\0';
 
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    return 0;
 
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}