Initial commit of shlib interface

1 files changed, 72 insertions, 0 deletions

diff --git a/src/shlib.c b/src/shlib.c
new file mode 100644
index 0000000..b9cb3d7
--- /dev/null
+++ b/src/shlib.c
@@ -0,0 +1,72 @@
+#include "spm.h"
+#include "shlib.h"
+
+char *shlib_deps_objdump(const char *_filename) {
+    // do not expose this function
+    char *filename = NULL;
+    char *result = NULL;
+    Process *proc = NULL;
+    char cmd[PATH_MAX];
+    memset(cmd, '\0', sizeof(cmd));
+
+    if ((filename = strdup(_filename)) == NULL) {
+        fprintf(SYSERROR);
+        return NULL;
+    }
+
+    strchrdel(filename, "&;|");
+    snprintf(cmd, sizeof(cmd), "%s %s '%s'", "objdump", "-p", filename);
+    shell(&proc, SHELL_OUTPUT, cmd);
+
+    if (proc->returncode != 0) {
+        free(filename);
+        shell_free(proc);
+        return NULL;
+    }
+    result = strdup(proc->output);
+
+    free(filename);
+    shell_free(proc);
+    return result;
+}
+
+StrList *shlib_deps(const char *filename) {
+    char **data = NULL;
+    char *output = NULL;
+    StrList *result = NULL;
+
+    // Get output from objdump
+    // TODO: use preprocessor or another function to select the correct shlib_deps_*() in the future
+    if ((output = shlib_deps_objdump(filename)) == NULL) {
+        return NULL;
+    }
+
+    // Initialize list array
+    if ((result = strlist_init()) == NULL) {
+        free(output);
+        return NULL;
+    }
+
+    // Split output into individual lines
+    if ((data = split(output, "\n")) == NULL) {
+        free(output);
+        strlist_free(result);
+        return NULL;
+    }
+
+    // Parse output:
+    // Collapse whitespace and extract the NEEDED libraries (second field)
+    // AFAIK when "NEEDED" is present, a string containing the library name is guaranteed to be there
+    for (size_t i = 0; data[i] != NULL; i++) {
+        data[i] = normalize_space(data[i]);
+        if (startswith(data[i], "NEEDED") == 0) {
+            char **field = split(data[i], " ");
+            strlist_append(result, field[1]);
+            split_free(field);
+        }
+    }
+
+    free(output);
+    split_free(data);
+    return result;
+}