rohrpost

A commandline mail client to change the world as we see it.
git clone git://r-36.net/rohrpost
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param.c (1812B)

      1 /*
      2  * Copy me if you can.
      3  * by 20h
      4  */
      5 
      6 #include <unistd.h>
      7 #include <stdlib.h>
      8 #include <stdio.h>
      9 #include <string.h>
     10 
     11 #include "ind.h"
     12 
     13 char *
     14 paramenc(char *str, int len)
     15 {
     16 	char *ret, add[6];
     17 	int i, rlen, alen;
     18 
     19 	ret = NULL;
     20 	for (i = 0, rlen = 0; i < len; i++) {
     21 		if (str[i] < 0x20 || str[i] > 0x7E)
     22 			snprintf(add, sizeof(add), "%%%02x", str[i] & 0xFF);
     23 		else {
     24 			switch(str[i]) {
     25 			case ' ':
     26 				add[0] = '_';
     27 				add[1] = '\0';
     28 				break;
     29 			case '\'':
     30 			case '_':
     31 			case '%':
     32 			case '(':
     33 			case ')':
     34 			case '<':
     35 			case '>':
     36 			case '@':
     37 			case ',':
     38 			case ';':
     39 			case ':':
     40 			case '\\':
     41 			case '"':
     42 			case '/':
     43 			case '[':
     44 			case ']':
     45 			case '?':
     46 			case '=':
     47 				snprintf(add, sizeof(add), "%%%02x",
     48 						str[i] & 0xFF);
     49 				break;
     50 			default:
     51 				add[0] = str[i];
     52 				add[1] = '\0';
     53 				break;
     54 			}
     55 		}
     56 		alen = strlen(add);
     57 		ret = memdupcat(ret, rlen, add, alen+1);
     58 		rlen += alen;
     59 	}
     60 
     61 	return ret;
     62 }
     63 
     64 char *
     65 paramdec(char *str, int *len)
     66 {
     67 	char *ret, add, abuf[3], *eabuf;
     68 	int i, rlen, pbreak;
     69 	long nval;
     70 
     71 	ret = NULL;
     72 	for (i = 0, rlen = 0; i < *len; i++) {
     73 		add = '\0';
     74 		pbreak = 0;
     75 		switch (str[i]) {
     76 		case '_':
     77 			add = ' ';
     78 			break;
     79 		case '%':
     80 			if (str[i+1] == '\n' || str[i+2] == '\0') {
     81 				pbreak = 1;
     82 				i++;
     83 				break;
     84 			}
     85 			if (str[i+1] == '\0')
     86 				break;
     87 			memmove(&abuf, &str[i+1], 2);
     88 			abuf[2] = '\0';
     89 
     90 			eabuf = NULL;
     91 			nval = strtol((char *)&abuf, &eabuf, 16);
     92 			if (eabuf != NULL && *eabuf != '\0')
     93 				break;
     94 
     95 			add = (char)(nval & 0xFF);
     96 			i += 2;
     97 			break;
     98 		default:
     99 			add = str[i];
    100 			break;
    101 		}
    102 		if (pbreak)
    103 			continue;
    104 		if (add == '\0')
    105 			break;
    106 
    107 		ret = reallocz(ret, ++rlen+1, 0);
    108 		ret[rlen-1] = add;
    109 		ret[rlen] = '\0';
    110 	}
    111 	if (add == '\0' && ret != NULL) {
    112 		free(ret);
    113 		return NULL;
    114 	}
    115 
    116 	*len = rlen;
    117 	return ret;
    118 }
    119