80 lines
1.8 KiB
C
80 lines
1.8 KiB
C
#include "util.h"
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#include <ctype.h>
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#include <stdbool.h>
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#include <stdlib.h>
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#include <string.h>
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char *remove_whitespaces(const char *str) {
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char tmp[strlen(str)];
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size_t i = 0;
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size_t j = 0;
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while (str[i] != '\0') {
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if (isspace(str[i])) {
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i += 1;
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continue;
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}
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tmp[j] = str[i];
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i += 1;
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j += 1;
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}
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char *ret = malloc(j * sizeof(char));
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strncpy(ret, tmp, j);
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ret[j] = '\0';
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return ret;
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}
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char *resolve_env_vars(const char *str) {
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size_t len = strlen(str);
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char *ret = malloc(MAX_PATH_LENGTH * sizeof(char));
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size_t ret_offset = 0;
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bool in_env_var = false;
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char env_var[MAX_PATH_LENGTH];
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memset(env_var, 0, sizeof(env_var));
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size_t env_var_offset = 0;
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for (size_t i = 0; i < len; ++i) {
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if (str[i] == '~') {
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char *home = getenv("HOME");
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strcat(ret, home);
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ret_offset += strlen(home);
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continue;
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}
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if (str[i] == '$') {
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in_env_var = true;
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continue;
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}
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// end of current env var
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if (in_env_var && !(isalpha(str[i]) || isdigit(str[i]) || str[i] == '_')) {
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in_env_var = false;
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char *env = getenv(env_var);
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strcat(ret, env);
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ret_offset += strlen(env);
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memset(env_var, 0, sizeof(env_var));
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env_var_offset = 0;
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}
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if (in_env_var) {
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env_var[env_var_offset] = str[i];
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env_var_offset += 1;
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continue;
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}
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ret[ret_offset] = str[i];
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ret_offset += 1;
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}
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ret[ret_offset] = '\0';
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return ret;
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}
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char *process_str(const char *str) {
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char *whitespaceless = remove_whitespaces(str);
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char *ret = resolve_env_vars(whitespaceless);
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free(whitespaceless);
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return ret;
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}
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