86 lines
2.3 KiB
C
86 lines
2.3 KiB
C
/*
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* vim: sw=2 ts=2 expandtab
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*
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* "THE PIZZA-WARE LICENSE" (derived from "THE BEER-WARE LICENCE"):
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* Thomas Kolb <cfr34k@tkolb.de> wrote this file. As long as you retain this
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* notice you can do whatever you want with this stuff. If we meet some day,
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* and you think this stuff is worth it, you can buy me a pizza in return.
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* - Thomas Kolb
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*/
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#include <stdio.h>
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#include <stdint.h>
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#include <string.h>
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#include <malloc.h>
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#include <errno.h>
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#include "util.h"
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#include "logger.h"
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void remove_trailing_slash(char *str) {
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size_t offset = strlen(str)-1;
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if((offset != 0) && (str[offset] == '/')) {
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str[offset] = '\0';
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}
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}
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void urlencode(const char *str, char *result) {
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uint8_t c;
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while(*str) {
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c = *str;
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if((c >= 'a' && c <= 'z') ||
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(c >= 'A' && c <= 'Z') ||
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(c >= '0' && c <= '9') ||
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c == '-' ||
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c == '_' ||
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c == '!' ||
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c == '(' ||
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c == ')' ||
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c == '$' ||
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c == '*' ||
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c == '\'' ||
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c == ',' ||
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c == '.') {
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// simply print safe characters
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result += sprintf(result, "%c", c);
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} else {
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// encode all others
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result += sprintf(result, "%%%02X", c);
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}
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str++;
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}
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}
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/*!
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* Append src to target, reallocating target on the way if necessary.
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*
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* \param target The string to append to.
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* \param targetsize A pointer to the size of target. Will be updated by this
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* function when target is reallocated.
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* \param src The string to append to target.
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* \returns A pointer to new string (target becomes invalid in the
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* event of reallocation) or NULL on a realloc error.
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*/
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char* safe_append(char *target, size_t *targetsize, const char *src) {
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size_t targetlen = strlen(target);
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size_t srclen = strlen(src);
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size_t newsize = 2*targetlen + srclen + 1;
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// check if reallocation is necessary
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if((targetlen + srclen) >= *targetsize) {
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LOG(LVL_DEBUG, "safe_append: reallocating target string: %lu -> %lu characters", *targetsize, newsize);
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target = realloc(target, newsize * sizeof(char));
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if(target == NULL) {
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LOG(LVL_ERR, "safe_append: realloc failed: %s", strerror(errno));
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return NULL;
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}
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*targetsize = newsize;
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}
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return strcat(target, src);
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}
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