114 lines
2.0 KiB
C
114 lines
2.0 KiB
C
#include "minishell.h"
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static void buf_append(char **buf, size_t *len, size_t *cap, const char *s)
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{
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size_t slen;
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char *newbuf;
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if (!s)
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return;
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slen = strlen(s);
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if (*len + slen + 1 > *cap)
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{
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*cap = (*len + slen + 1) * 2;
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newbuf = (char *)realloc(*buf, *cap);
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if (!newbuf)
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return;
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*buf = newbuf;
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}
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memcpy(*buf + *len, s, slen);
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*len += slen;
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(*buf)[*len] = '\0';
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}
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static void buf_append_char(char **buf, size_t *len, size_t *cap, char c)
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{
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char tmp[2];
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tmp[0] = c;
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tmp[1] = '\0';
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buf_append(buf, len, cap, tmp);
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}
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static char *expand_word(const char *word, t_shell *sh)
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{
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int in_single = 0;
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int in_double = 0;
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size_t i = 0;
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char *out = NULL;
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size_t len = 0, cap = 0;
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while (word && word[i])
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{
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if (word[i] == '\'' && !in_double)
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{
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in_single = !in_single;
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i++;
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continue;
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}
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if (word[i] == '"' && !in_single)
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{
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in_double = !in_double;
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i++;
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continue;
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}
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if (word[i] == '$' && !in_single)
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{
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if (word[i + 1] == '?')
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{
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char *v = ms_itoa(sh->last_status);
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buf_append(&out, &len, &cap, v);
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free(v);
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i += 2;
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continue;
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}
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if (ms_is_alpha((unsigned char)word[i + 1]))
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{
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size_t j = i + 1;
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while (word[j] && ms_is_alnum((unsigned char)word[j]))
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j++;
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char *name = ms_strndup(word + i + 1, j - (i + 1));
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char *val = env_get(sh, name);
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buf_append(&out, &len, &cap, val ? val : "");
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free(name);
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i = j;
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continue;
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}
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}
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buf_append_char(&out, &len, &cap, word[i]);
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i++;
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}
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if (!out)
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out = ms_strdup("");
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return out;
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}
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int expand_pipeline(t_pipeline *p, t_shell *sh)
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{
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size_t i;
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int j;
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for (i = 0; i < p->count; i++)
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{
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for (j = 0; p->cmds[i]->argv && p->cmds[i]->argv[j]; j++)
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{
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char *neww = expand_word(p->cmds[i]->argv[j], sh);
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free(p->cmds[i]->argv[j]);
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p->cmds[i]->argv[j] = neww;
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}
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if (p->cmds[i]->redirs)
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{
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t_redir *r = p->cmds[i]->redirs;
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while (r)
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{
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if (r->target)
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{
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char *nt = expand_word(r->target, sh);
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free(r->target);
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r->target = nt;
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}
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r = r->next;
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}
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}
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}
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return 0;
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}
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